Urination is the release of urine from the urinary bladder through the urethra to the urinary meatus outside of the body. It is also known medically as micturition, voiding, uresis, or, rarely, emiction, and known colloquially by various names including tinkling, peeing, weeing, and pissing. In healthy humans (and many other animals) the process of urination is under voluntary control. In infants, some elderly individuals, and those with neurological injury, urination may occur as an involuntary reflex. In some animals, in addition to expelling waste material, urination can mark territory or express submissiveness. Physiologically, urination involves coordination between the central, autonomic, and somatic nervous systems. Brain centers that regulate urination include the pontine micturition center, periaqueductal gray, and the cerebral cortex. In male placental mammals, urine is ejected through the penis. In female placental mammals, urine is ejected through the vulva or pseudo-penis.
- 1 Anatomy and physiology
- 1.1 Anatomy of the bladder and outlet
- 1.2 Physiology
- 1.3 Disorders
- 2 Techniques
- 3 Social and cultural aspects
- 4 Other species
- 5 See also
- 6 References
- 7 Bibliography
- 8 External links
Anatomy and physiology
Anatomy of the bladder and outlet
The main organs involved in urination are the urinary bladder and the urethra. The smooth muscle of the bladder, known as the detrusor, is innervated by parasympathetic nervous system fibers from the lumbar spinal cord and parasympathetic fibers from the sacral spinal cord. Fibers in the pelvic nerves constitute the main afferent limb of the voiding reflex; the parasympathetic fibers to the bladder that constitute the excitatory efferent limb also travel in these nerves. Part of the urethra is surrounded by the external urethral sphincter, which is innervated by the somatic pudendal nerve originating in the cord, in an area termed Onuf's nucleus.
Smooth muscle bundles pass on either side of the urethra, and these fibers are sometimes called the internal urethral sphincter, although they do not encircle the urethra. Further along the urethra is a sphincter of skeletal muscle, the sphincter of the membranous urethra (external urethral sphincter). The bladder's epithelium is termed transitional epithelium which contains a superficial layer of dome-like cells and multiple layers of stratified cuboidal cells underneath when evacuated. When the bladder is fully distended the superficial cells become squamous (flat) and the stratification of the cuboidal is reduced in order to provide lateral stretching.
The physiology of micturition and the physiologic basis of its disorders are subjects about which there is much confusion, especially at the supraspinal level. Micturition is fundamentally a spinobulbospinal reflex facilitated and inhibited by higher brain centers such as the pontine micturition center and, like defecation, subject to voluntary facilitation and inhibition.
In healthy individuals, the lower urinary tract has two discrete phases of activity: the storage (or guarding) phase, when urine is stored in the bladder; and the voiding phase, when urine is released through the urethra. The state of the reflex system is dependent on both a conscious signal from the brain and the firing rate of sensory fibers from the bladder and urethra. At low bladder volumes, afferent firing is low, resulting in excitation of the outlet (the sphincter and urethra), and relaxation of the bladder. At high bladder volumes, afferent firing increases, causing a conscious sensation of urinary urge. When the individual is ready to urinate, he or she consciously initiates voiding, causing the bladder to contract and the outlet to relax. Voiding continues until the bladder empties completely, at which point the bladder relaxes and the outlet contracts to re-initiate storage. The muscles controlling micturition are controlled by the autonomic and somatic nervous systems. During the storage phase the internal urethral sphincter remains tense and the detrusor muscle relaxed by sympathetic stimulation. During micturition, parasympathetic stimulation causes the detrusor muscle to contract and the internal urethral sphincter to relax. The external urethral sphincter (sphincter urethrae) is under somatic control and is consciously relaxed during micturition.
It is commonly believed that in infants, voiding occurs involuntarily (as a reflex). However, the practice of elimination communication suggests otherwise. The ability to voluntarily inhibit micturition develops by the age of 2–3 years, as control at higher levels of the central nervous system develops. In the adult, the volume of urine in the bladder that normally initiates a reflex contraction is about 300–400 millilitres (11–14 imp fl oz; 10–14 US fl oz)
During storage, bladder pressure stays low, because of the bladder's highly compliant nature. A plot of bladder (intravesical) pressure against the depressant of fluid in the bladder (called a cystometrogram), will show a very slight rise as the bladder is filled. This phenomenon is a manifestation of the law of Laplace, which states that the pressure in a spherical viscus is equal to twice the wall tension divided by the radius. In the case of the bladder, the tension increases as the organ fills, but so does the radius. Therefore, the pressure increase is slight until the organ is relatively full. The bladder's smooth muscle has some inherent contractile activity; however, when its nerve supply is intact, stretch receptors in the bladder wall initiate a reflex contraction that has a lower threshold than the inherent contractile response of the muscle.
Action potentials carried by sensory neurons from stretch receptors in the urinary bladder wall travel to the sacral segments of the spinal cord through the pelvic nerves. Since bladder wall stretch is low during the storage phase, these afferent neurons fire at low frequencies. Low-frequency afferent signals cause relaxation of the bladder by inhibiting sacral parasympathetic preganglionic neurons and exciting lumbar sympathetic preganglionic neurons. Conversely, afferent input causes contraction of the sphincter through excitation of Onuf's nucleus, and contraction of the bladder neck and urethra through excitation of the sympathetic preganglionic neurons.
Diuresis (production of urine by the kidney) occurs constantly, and as the bladder becomes full, afferent firing increases, yet the micturition reflex can be voluntarily inhibited until it is appropriate to begin voiding.
Voiding begins when a voluntary signal is sent from the brain to begin urination, and continues until the bladder is empty.
Bladder afferent signals ascend the spinal cord to the periaqueductal gray, where they project both to the pontine micturition center and to the cerebrum. At a certain level of afferent activity, the conscious urge to void becomes difficult to ignore. Once the voluntary signal to begin voiding has been issued, neurons in pontine micturition center fire maximally, causing excitation of sacral preganglionic neurons. The firing of these neurons causes the wall of the bladder to contract; as a result, a sudden, sharp rise in intravesical pressure occurs. The pontine micturition center also causes inhibition of Onuf's nucleus, resulting in relaxation of the external urinary sphincter. When the external urinary sphincter is relaxed urine is released from the urinary bladder when the pressure there is great enough to force urine to flow out of the urethra. The micturition reflex normally produces a series of contractions of the urinary bladder.
The flow of urine through the urethra has an overall excitatory role in micturition, which helps sustain voiding until the bladder is empty.
After urination, the female urethra empties partially by gravity, with assistance from muscles.[clarification needed] Urine remaining in the male urethra is expelled by several contractions of the bulbospongiosus muscle, and, by some men, manual squeezing along the length of the penis to expel the rest of the urine.
For land mammals over 1 kilogram, the duration of urination does not vary with body mass, being dispersed around an average of 21 seconds (standard deviation 13 seconds), despite a 4 order of magnitude (1000×) difference in bladder volume. This is due to increased urethra length of large animals, which amplifies gravitational force (hence flow rate), and increased urethra width, which increases flow rate. For smaller mammals a different phenomenon occurs, where urine is discharged as droplets, and urination in smaller mammals, such as mice and rats, can occur in less than a second. The posited benefits of faster voiding are decreased risk of predation (while voiding) and decreased risk of urinary tract infection.
The mechanism by which voluntary urination is initiated remains unsettled. One possibility is that the voluntary relaxation of the muscles of the pelvic floor causes a sufficient downward tug on the detrusor muscle to initiate its contraction. Another possibility is the excitation or disinhibition of neurons in the pontine micturition center, which causes concurrent contraction of the bladder and relaxation of the sphincter.
There is an inhibitory area for micturition in the midbrain. After transection of the brain stem just above the pons, the threshold is lowered and less bladder filling is required to trigger it, whereas after transection at the top of the midbrain, the threshold for the reflex is essentially normal. There is another facilitatory area in the posterior hypothalamus. In humans with lesions in the superior frontal gyrus, the desire to urinate is reduced and there is also difficulty in stopping micturition once it has commenced. However, stimulation experiments in animals indicate that other cortical areas also affect the process.
The bladder can be made to contract by voluntary facilitation of the spinal voiding reflex when it contains only a few milliliters of urine. Voluntary contraction of the abdominal muscles aids the expulsion of urine by increasing the pressure applied to the urinary bladder wall, but voiding can be initiated without straining even when the bladder is nearly empty.
Voiding can also be consciously interrupted once it has begun, through a contraction of the perineal muscles. The external sphincter can be contracted voluntarily, which will prevent urine from passing down the urethra.
Voiding can be facilitated by immersing a hand in a cup or sink full of warm water. The mechanism is unclear. The phenomenon (and perhaps immersion diuresis) has given rise to the trick of immersing the hand of a sleeping person in water to make this victim urinate in sleep, although the efficacy of the trick is disputed.
Experience of urination
The need to urinate is experienced as an uncomfortable, full feeling. It is highly correlated with the fullness of the bladder. In many males the feeling of the need to urinate can be sensed at the base of the penis as well as the bladder, even though the neural activity associated with a full bladder comes from the bladder itself, and can be felt there as well. In females the need to urinate is felt in the lower abdomen region when the bladder is full. When the bladder becomes too full, the sphincter muscles will involuntarily relax, allowing urine to pass from the bladder. Release of urine is experienced as a lessening of the discomfort.
Many clinical conditions can cause disturbances to normal urination, including:
- Urinary incontinence, the inability to hold urine
- Urinary retention, the inability to initiate urination
- Overactive bladder, a strong urge to urinate, usually accompanied by detrusor overactivity
- Interstitial cystitis, a condition characterized by urinary frequency, urgency, and pain
- Prostatitis, an inflammation of the prostate gland that can cause urinary frequency, urgency, and pain
- Benign prostatic hyperplasia, an enlargement of the prostate that can cause urinary frequency, urgency, retention, and the dribbling of urine
- Urinary tract infection, which can cause urinary frequency and dysuria
- Polyuria, abnormally large production of urine, associated with, in particular, diabetes mellitus (types 1 and 2), and diabetes insipidus
- Oliguria, low urine output, usually due to a problem with the upper urinary tract
- Anuria refers to absent or almost absent urine output.
- Micturition syncope, a vasovagal response which may cause fainting.
- Paruresis, the inability to urinate in the presence of others, such as in a public toilet.
Experimentally induced disorders
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There are three major types of bladder dysfunction due to neural lesions: (1) the type due to interruption of the afferent nerves from the bladder; (2) the type due to interruption of both afferent and efferent nerves; and (3) the type due to interruption of facilitatory and inhibitory pathways descending from the brain. In all three types the bladder contracts, but the contractions are generally not sufficient to empty the viscus completely, and residual urine is left in the bladder. Paruresis, also known as shy bladder syndrome, is an example of a bladder interruption from the brain that often causes total interruption until the person has left a public area. As these people may have difficulty urinating in the presence of others and will consequently avoid using urinals directly adjacent to another person. Alternatively, they may opt for the privacy of a stall or simply avoid public toilets altogether.
When the sacral dorsal roots are cut in experimental animals or interrupted by diseases of the dorsal roots such as tabes dorsalis in humans, all reflex contractions of the bladder are abolished. The bladder becomes distended, thin-walled, and hypotonic, but there are some contractions because of the intrinsic response of the smooth muscle to stretch.
When the afferent and efferent nerves are both destroyed, as they may be by tumors of the cauda equina or filum terminale, the bladder is flaccid and distended for a while. Gradually, however, the muscle of the "decentralized bladder" becomes active, with many contraction waves that expel dribbles of urine out of the urethra. The bladder becomes shrunken and the bladder wall hypertrophied. The reason for the difference between the small, hypertrophic bladder seen in this condition and the distended, hypotonic bladder seen when only the afferent nerves are interrupted is not known. The hyperactive state in the former condition suggests the development of denervation hypersensitization even though the neurons interrupted are preganglionic rather than postganglionic.
Spinal cord transection
During spinal shock, the bladder is flaccid and unresponsive. It becomes overfilled, and urine dribbles through the sphincters (overflow incontinence). After spinal shock has passed, the voiding reflex returns, although there is no voluntary control and no inhibition or facilitation from higher centers when the spinal cord is transected. Some paraplegic patients train themselves to initiate voiding by pinching or stroking their thighs, provoking a mild mass reflex. In some instances, the voiding reflex becomes hyperactive. Bladder capacity is reduced, and the wall becomes hypertrophied. This type of bladder is sometimes called the spastic neurogenic bladder. The reflex hyperactivity is made worse by, and may be caused by, infection in the bladder wall.
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Due to the positions where the urethra exits the body, males and females often use different techniques for urination.
Some males prefer to urinate standing while other prefer to urinate sitting or squatting. Elderly males with prostate problems may benefit from sitting down while in healthy males, no difference is found in the ability to urinate. For practising Muslim men, the genital modesty of squatting is also associated with proper cleanliness requirements or awra.
In human females, the urethra opens straight into the vulva. Hence, in many Western cultures, urination will often take place while sitting on a toilet, like defecation. It is also possible for females to urinate while standing, and while clothed. Reports indicate that it is common that women in various regions of Africa use this method when they urinate,[need quotation to verify] as do women in Laos.[not in citation given] Herodotus described a similar custom in ancient Egypt. An alternative method for women to urinate standing is to use a tool known as a female urination device to assist.
Babies and toddlers
A common technique used in many undeveloped nations involves holding the child by the backs of the thighs, above the ground, facing outward, in order to urinate.
Urination after injury
Occasionally, if a male's penis is damaged or removed, or a female's genitals/urinary tract is damaged, other urination techniques must be used. Most often in such cases, doctors will reposition the urethra to a location where urination can still be accomplished, usually in a position that would only promote urination while seated/squatting, though a permanent urinary catheter may be used in rare cases.
It is socially more accepted and more environmentally hygienic for those who are able to urinate in a toilet. Public toilets may have urinals, usually for males, although female urinals exist, designed to be used in various ways.
Alternative urination tools
Sometimes urination is done in a container such as a bottle, urinal, bedpan or chamber pot, also known as a gazunder, e.g., in case of lying sick in bed, in the case that the urine has to be examined (for medical reasons, or for a drug test), or when no toilet is available, and there is no other possibility to dispose of the urine right away.
For the latter application a more expensive solution (hence for special occasions while traveling etc.) is a special disposable bag containing absorbent material that solidifies the urine within ten seconds, making it convenient and safe to keep.
It is possible for both sexes to urinate into bottles in case of emergencies. The technique can help the sickly and the children to urinate discreetly inside cars and in other places without being seen by others.
Social and cultural aspects
Babies have little socialized control over urination within traditions or families that do not practice elimination communication and instead use diapers. Toilet training is the process of learning to restrict urination to socially approved times and situations. Consequently, young children sometimes suffer from nocturnal enuresis.
Urination without facilities
Acceptability of outdoor urination in a public place other than at a public urinal varies with the situation and with customs. Potential disadvantages include a dislike of the smell of urine, and some exposure of genitals. The latter can be unpleasant for the one who exposes them (modesty, lack of privacy) and/or those who can see them; it can be avoided or mitigated by going to a quiet place and/or facing a tree or wall if urinating standing up, or while squatting, hiding the back behind walls, bushes, or a tree.
The more developed and crowded a place is, the more urination tends to be objectionable. In the countryside, it is more acceptable than in a street in a town. In the latter case it is a common transgression. Often this is done after the consumption of alcoholic beverages. The alcohol causes production of additional urine as well as a reduction of inhibitions. In many places, public urination is punishable by fines, though attitudes vary widely by country. It is often more accepted in Europe and Asia for males but tends to be socially objectionable for females in most countries.
Contrary to popular belief, it has never been explicitly legal in the UK for a man to urinate in public so long as it occurred on the rear wheel of his vehicle and he had his right hand on the vehicle. Public urination still remains more accepted by males in the UK, although British cultural tradition itself seems to find such practices objectionable. Depending on the culture, adult women, unlike men, are restricted in where they can urinate. For Muslims, it is haram to urinate while facing the qibla.
According to some medical studies, women generally need to urinate more frequently than men (due to women having smaller bladders in general). Resisting the urge to urinate because of lack of facilities can promote urinary tract infections which can lead to more serious infections and, in rare situations, can cause renal damage in women. Female urination devices also claim to allow women to urinate discreetly.
Standing versus sitting
Discussions about the optimal position in which to urinate are quite common amongst men, especially in the West. The standing position is often regarded as superior and masculine to the sitting and as a way to differentiate men from women. However, in public conveniences and sometimes at home, men are urged to use the sitting position as to diminish spattering of urine. Arguments in these discussions are often based on these beliefs, and evidence for medical superiority was heterogenic. A meta-analysis on these studies showed that males with an enlarged prostate urinated better in the sitting position compared to the standing. The amount of residual urine in the bladder was significantly reduced, and there was a trend towards a more powerful flow and shorter voiding time. Combined, this reduces the risk of bladder stones and urinary tract infections. The same study showed that healthy males were not influenced by position, meaning that they could urinate in either position. While it is uncommon for women to stand while urinating, this practice is becoming more common. Denise Decker, a nurse who advocates for this practice, surveyed 600 women to discover how interested they were in having female urination devices that would allow them to urinate in a standing position, and the majority of respondents indicated a desire to have such a device.
A partially squatting position (or "hovering") while urinating, often done to avoid sitting on a potentially contaminated toilet seat, may leave urine behind in the bladder. It can also result in urine landing on the toilet seat.
Talking about urination
In many societies and in many social classes, even mentioning the need to urinate is seen as a social transgression, despite it being a universal need. Even today, many adults avoid stating that they need to urinate.
Many expressions exist, some euphemistic and some vulgar. For example, centuries ago the standard English word (both noun and verb, for the product and the activity) was "piss", but subsequently "pee", formerly associated with children, has become more common in general public speech. Since elimination of bodily wastes is, of necessity, a subject talked about with toddlers during toilet training, other expressions considered suitable for use by and with children exist, and some continue to be used by adults, e.g. "weeing", "doing/having a wee-wee", "to tinkle", "potty".
Other expressions include "squirting" and "taking a leak", and, predominantly by younger persons for outdoor female urination, "popping a squat", referring to the position many women adopt in such circumstances. National varieties of English show creativity. American English uses "to whiz". Australian English has coined "I am off to take a Chinese singing lesson", derived from the tinkling sound of urination against the China porcelain of a toilet bowl. British English uses "going to see my aunt", "going to see a man about a dog", "to piddle", "to splash (one's) boots", as well as "to have a slash", which originates from the Scottish term for a large splash of liquid. One of the most common, albeit old-fashioned, euphemisms in British English is "to spend a penny", a reference to coin-operated pay toilets, which used (pre-decimalisation) to charge that sum.
Use in language
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References to urination are commonly used in slang. Usage in English includes:
- Piss (someone) off (to anger someone; alternatively, to leave somewhere in a hurry)
- Piss off! (to express contempt; see above)
- Pissing down (to refer to heavy rain)
- Pissing contest (an unproductive ego-driven battle)
- Pisshead (vulgar way to refer to someone who drinks too much alcohol)
- Piss ant (a worthless person; in non-slang usage the term refers to several species of ant whose colonies have a urine-like odor)
- Pissing up a flagpole (to partake in a futile activity)
- Pissing into the wind (to act in ways that cause self-harm)
- Piss away (to squander or use wastefully)
- Taking the piss (to take liberties, be unreasonable, or to mock another person)
Urination and sexual activity
Urolagnia is an inclination to obtain sexual enjoyment by looking at or thinking of urine or urination. As a paraphilia, urine may be consumed, or the person may bathe in it. Drinking urine is known as urophagia, though uraphagia refers to the consumption of urine regardless of whether the context is sexual. Involuntary urination during sexual intercourse is common, but rarely acknowledged. In one survey, 24% of women reported involuntary urination during sexual intercourse; in 66% of sufferers urination occurred on penetration, while in 33% urine leakage was restricted to orgasm.
A male Patagonian mara, a type of rodent, will stand on his hind legs and urinate on a female’s rump, to which the female will respond by spraying a jet of urine backwards into the face of the male. The male’s urination is meant to repel other males from his partner while the female’s urination is a rejection of any approaching male when she is not receptive. Both anal digging and urination are more frequent during the breeding season and are more commonly done by males.
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While the primary purpose of urination is the same across the animal kingdom, urination often serves a social purpose beyond the expulsion of waste material. In dogs and other animals, urination can mark territory or express submissiveness. In small rodents such as rats and mice, it marks familiar paths.
The urine of animals of differing physiology or sex sometimes has different characteristics. For example, the urine of birds and reptiles is whitish, consisting of a pastelike suspension of uric acid crystals, and discharged with the feces of the animal via the cloaca, whereas mammals' urine is a yellowish colour, with mostly urea instead of uric acid, and is discharged via the urethra, separately from the feces. Some animals' (example: carnivores') urine possesses a strong odour, especially when it is used to mark territory or [clarify]
Stallions sometimes exhibit the Flehmen response by smelling the urine of a mare in heat. A stallion sometimes scent marks his urination spots to make his position as herd stallion clear. A male horse's penis is protected by a sheath when it is not in use for urination.
Ring-tailed lemurs have also been shown to mark using urine. Behaviorally, there is a difference between regular urination, where the tail is slightly raised and a stream of urine is produced, and the urine marking behavior, where the tail is held up in display and only a few drops of urine are used. The urine-marking behavior is typically used by females to mark territory, and has been observed primarily at the edges of the troop's territory and in areas where other troops may frequent. The urine marking behavior is also most frequent during the mating season, and may play a role in reproductive communication between groups. Some other primate species use also urine for scent-marking. The white-headed capuchin sometimes engages in a practice known as "urine washing", in which the monkey rubs urine on its feet. Urine washing, in which urine is rubbed on the hands and feet, is also used by the Panamanian night monkey. In some cases, strepsirrhines may also anoint themselves with urine.
Hyenas do not raise their legs as canids do when urinating, as urination serves no territorial function for them. Instead, hyenas mark their territories using their anal glands, a trait found also in viverrids and mustelids, but not canids and felids. Unlike other female mammals, female spotted hyenas urinate, copulate, and give birth through an organ called the pseudo-penis.
All canids (with the possible exception of dholes) use urine (combined with preputial gland secretions) to mark their territories. Many species of canids, including hoary foxes, cape foxes, and golden jackals, use a raised-leg posture when urinating. The scent of their urine is usually strongest in the winter, before the mating season.
Domestic dogs mark their territories by urinating on vertical surfaces (usually at nose level), sometimes marking over the urine of other dogs. When one dog marks over another dog's urine, this is known as "counter-marking" or "overmarking". Male dogs urine-mark more frequently than female dogs, typically beginning after the onset of sexual maturity. Male dogs, as well as wolves, sometimes lift a leg and attempt to urinate even when their bladders are empty - this is known as a "raised-leg display", "shadow-urination", or "pseudo-urination". They typically mark their territory due to the presence of new stimuli or social triggers in a dog's environment, as well as out of anxiety. Marking behavior is present in both male and female dogs, and is especially pronounced in male dogs that have not been neutered.
Raised-leg urination is the most significant form of scent marking in wolves, and is most frequent around the breeding season. Wolves urine-mark more frequently when they detect the scent of other wolves, or other canid species. Leg-lifting is more common in male wolves than female wolves, although dominant females also use the raised-leg posture. Urine marking is the best-studied means of olfactory communication in wolves. Its exact function is debated, though most researchers agree that its primary purpose is to establish boundaries. Wolves urine mark more frequently and vigorously in unfamiliar areas, or areas of intrusion, where the scent of other wolves or canids is present. So-called raised leg urination (RLU) is more common in male wolves than in females, and may serve the purpose of maximizing the possibility of detection by other members of the marking wolf's species, and reflect the animal's height. Only dominant wolves typically use RLU, with subordinate males continuing to use the juvenile standing posture throughout adulthood. Other types of urine-marking in wolves are FLU (flexed-leg urination), STU (standing urination), and SQU (squatting urination). Breeding pairs of wolves will sometimes urinate on the same spot: this is known as "double-marking". Double-marking is practiced by both coyotes and wolves., and also by foxes.
Coyotes mark their territories by urinating on bushes, trees, or rocks. All male coyotes lift their legs when urinating. However, females sometimes also raise their legs, and males sometimes squat. Urine marking is also associated with pair bonding in coyotes[clarification needed] Coyotes sometimes urinate on their food, possibly to claim ownership over it.
Red foxes use their urine to mark their territories. A male fox raises one hind leg and his urine is sprayed forward in front of him, whereas a female fox squats down so that the urine is sprayed in the ground between the hind legs. Urine is also used to mark empty cache sites, as reminders not to waste time investigating them. Red foxes use [clarify] to urinate, depending on where they are leaving a scent mark.
As in most other canids, male bush dogs lift their hind legs when urinating. However, female bush dogs use a kind of handstand posture, which is less common in other canids. When male bush dogs urinate, they create a spray instead of a stream.
Both male and female maned wolves use their urine to communicate, e.g. to mark their hunting paths, or the places where they have buried hunted prey. The urine has a very distinctive smell, which some people liken to hops or cannabis. The responsible substance is very likely a pyrazine, which occurs in both plants. (At the Rotterdam Zoo, this smell once set the police on a hunt for cannabis smokers.)
Within the Felidae, male felids can urinate backwards by curving the tip of the glans penis backward. Urine marking by felids is also known as "spray-urinating" or "spray-marking". To identify their territories, male tigers mark trees by spraying urine and anal gland secretions, as well as marking trails with scat. Males show a grimacing face, called the Flehmen response, when identifying a female's reproductive condition by sniffing their urine markings.
Lions use urine to mark their territories. They often scrape the ground while urinating, and the urine often flows in short spurts, instead of flowing continuously. They often urinate on vegetation, or on tree trunks at least one meter high. Male lions spray 1-20 jets of urine at an angle of 20-30 degrees upward, at a range of up to 4 meters behind them.
Male cheetahs mark their territory by urinating on objects that stand out, such as trees, logs, or termite mounds. The whole coalition contributes to the scent. Males will attempt to kill any intruders, and fights result in serious injury or death. When male cheetahs urine-mark their territories, they stand a meter away from a tree or rock surface with the tail raised, pointing the penis either horizontally backward or 60° upward. The odor of cheetah urine (unlike that of other large felids) cannot be easily detected by humans.
- History of toilets
- Human positions
- Micturition syncope
- Potter sequence
- Stadium buddy (device)
- Marvalee H. Wake (15 September 1992). Hyman's Comparative Vertebrate Anatomy. University of Chicago Press. p. 583. ISBN 978-0-226-87013-7. Retrieved 6 May 2013.
- Roughgarden, Joan (2004). Evolution's Rainbow: Diversity, Gender, and Sexuality in Nature and People. University of California Press. p. 38. ISBN 978-0-520-24073-5. Retrieved 17 October 2013.
- Dixson, Alan F. (26 January 2012). Primate Sexuality: Comparative Studies of the Prosimians, Monkeys, Apes, and Humans. Oxford University Press. p. 364. ISBN 978-0-19-954464-6. Retrieved 17 October 2013.
- Wennemer, D.O., Heidi K. (2008-07-07). "Urinary Incontinence — Part 2". United States Department of Veterans Affairs. Archived from the original on 2008-09-25. Retrieved 2013-03-24.
- Rajaofetra N et al. (1992). "Serotoninergic, noradrenergic, and peptidergic innervation of Onuf's nucleus of normal and transected spinal cords of baboons (Papio papio)". J. Comp. Neurol. 318 (1): 1–17. doi:10.1002/cne.903180102. PMID 1374763.(subscription required)
- Yoshimura N, Chancellor MB (2003). "Neurophysiology of Lower Urinary Tract Function and Dysfunction". Rev Urol 5 (Suppl 8): S3–S10. PMC 1502389. PMID 16985987.
- de Groat WC, Ryall RW (January 1969). "Reflexes to sacral parasympathetic neurones concerned with micturition in the cat". J. Physiol. (Lond.) 200 (1): 87–108. PMC 1350419. PMID 5248885.
- Blok BF, Holstege G (January 1994). "Direct projections from the periaqueductal gray to the pontine micturition center (M-region). An anterograde and retrograde tracing study in the cat". Neurosci. Lett. 166 (1): 93–6. doi:10.1016/0304-3940(94)90848-6. PMID 7514777.
- Sie JA, Blok BF, de Weerd H, Holstege G (2001). "Ultrastructural evidence for direct projections from the pontine micturition center to glycine-immunoreactive neurons in the sacral dorsal gray commissure in the cat". J. Comp. Neurol. 429 (4): 631–7. doi:10.1002/1096-9861(20010122)429:4<631::AID-CNE9>3.0.CO;2-M. PMID 11135240.
- Elsevier[dead link]
- Yang, Patricia J.; Pham, Jonathan C.; Choo, Jerome; Hu, David L. (2013). "Law of Urination: all mammals empty their bladders over the same duration". arXiv:1310.3737 [physics].
- New Law of Urination: Mammals Take 20 Seconds to Pee, Carrie Arnold, National Geographic, October 23, 2013
- DasGupta R, Kavia RB, Fowler CJ (2007). "Cerebral mechanisms and voiding function". BJU Int. 99 (4): 731–4. doi:10.1111/j.1464-410X.2007.06749.x. PMID 17378838.
- Kinder MV, Bastiaanssen EH, Janknegt RA, Marani E (1995). "Neuronal circuitry of the lower urinary tract; central and peripheral neuronal control of the micturition cycle". Anat. Embryol. 192 (3): 195–209. doi:10.1007/BF00184744. PMID 8651504.
- Oliver S, Fowler C, Mundy A, Craggs M (2003). "Measuring the sensations of urge and bladder filling during cystometry in urge incontinence and the effects of neuromodulation". Neurourol. Urodyn. 22 (1): 7–16. doi:10.1002/nau.10082. PMID 12478595.
- de Jong, Y; Pinckaers, JH; Ten Brinck, RM; Lycklama À Nijeholt, AA; Dekkers, OM (2014). "Urinating Standing versus Sitting: Position Is of Influence in Men with Prostate Enlargement. A Systematic Review and Meta-Analysis.". PLOS ONE 9 (7): e101320. doi:10.1371/journal.pone.0101320. PMC 4106761. PMID 25051345.
- Y. de Jong. "Influence of voiding posture on urodynamic parameters in men: a literature review". Nederlands Tijdschrift voor urologie). Retrieved 2014-07-02.
- Mustafa Umar. "Standing up and urinating in Islam". Iman Suhaib Webb (USA). Retrieved 2013-06-11.
- "A Woman’s Guide on How to Pee Standing". Archived from the original on 2003-06-04.
- "Courtesy Laughs in the Ivory Coast". Travelblog.org. Retrieved 2013-02-10.
- "Women Standing and Men Squatting to Pee – A Personal Story (Mobile Version)". Experienceproject.com. Archived from the original on 2013-07-29.
- "Intersex Surgery, Female Genital Cutting, and the Selective Condemnation of "Cultural Practices"" (PDF). Retrieved 2013-02-10.
- "Washroom break". Humble Beginnings. Retrieved 2013-02-10.
- Sign, reading "Do not urinate here", showing both a man and a woman urinating standing up.
- Crossings in Equatoria Archived August 5, 2009 at the Wayback Machine[dead link]
- "Road to Hanoi". Travelblog.org. November 16, 2005. Retrieved 2013-02-10.
- Rothstein, Edward (10 December 2007). "Herodotus – The Histories – Connections". The New York Times. Retrieved 23 January 2010.
- Women Can 'Go' Like Men Now! at the Wayback Machine (archived October 11, 2009), ABC 2 News, Maryland, September 3, 2009
- Underwood et al. (2005). "Amniotic Fluid: Not Just Fetal Urine Anymore". Journal of Perinatology 25 (5): 341–348. doi:10.1038/sj.jp.721129. PMID 15861199.
- "Simple On-The-Go Potty and Hygiene Aid for Toddlers". My Pee Pee Bottle. Retrieved 2013-02-10.
- Review of Medical Physiology, twentieth edition, William F. Ganong, MD
- Relieved in Europe at the Wayback Machine (archived March 20, 2012)
- Mr. Sparkle (Dec 22, 2008). "432 Tips on Japan Warnings or Dangers - Stay Safe!". VirtualTourist. Retrieved 2013-02-10.
- "The appalling state of Sana’a school toilets". Yemen Times. 7 April 2008. Archived from the original on 2011-08-06.
- Why can’t men...??? — CASA Veneracion Jan 6, 2009
- Lafraniere, Sharon (23 December 2005). "Another School Barrier for African Girls: No Toilet". The New York Times. p. 1. Retrieved 13 January 2011.
- Peeing in public St. Lucia News
- Urination Explanation – why do Latin men pee in public? at the Wayback Machine (archived December 29, 2010). Rivierareporter.com (2010-08-02). Retrieved on 2011-01-22.
- [dead link]
- Amy Chavez (Jun 26, 2004). "Potty training for joy of the Grand Pee". The Japan Times.
- "From buttoned-up Britain to urine nation". New Statesman. Retrieved 26 February 2011.
- The new ourselves, growing older: women aging with knowledge and power, Paula Brown Doress-Worters, Diana Laskin Siegal, Boston Women's Health Book Collective, Simon & Schuster, 1994, Page 301
- Rizvi, Sayyid. Elements of Islamic studies. p. 24.
- "06/07/2002 - Mobile crews must have prompt access to nearby toilet facilities". Osha.gov. Retrieved 2013-02-10.
- "Urinary Tract Infection (UTI) Prevention – Urinary Tract Infection (UTI)". Urologychannel.com. Retrieved 2013-02-10.
- Carol Olmert (2008). Bathrooms Make Me Nervous: A Guidebook for Women with Urination Anxiety. CJOB Publications. p. 146. ISBN 0615240240.
- "Preventing kidney infection". nhs.uk. National Health Service. last reviewed 11 December 2012. Retrieved 22 September 2014. Check date values in:
- "have Chinese singing lesson". Definition-of.com. Retrieved 2013-02-10.
- "have a slash – Dictionary of sexual terms". Sex-lexis.com. Retrieved 2013-02-10.
- About the author... "Spend a penny". Phrases.org.uk. Retrieved 2013-02-10.
- "Definition of urolagnia". Oxforddictionaries.com. Retrieved 2013-02-10.
- HILTON, P. (1988), Urinary incontinence during sexual intercourse: a common, but rarely volunteered, symptom. BJOG: An International Journal of Obstetrics & Gynaecology, 95: 377–381. doi:10.1111/j.1471-0528.1988.tb06609.x
- Kick (2001)
- Imaginova (2007e)
- Genest H., Dubost G. (1974). "Pair living in the mara ( Dolichotis paragonum Z )". Mammalia 38: 155–162. doi:10.1515/mamm.1922.214.171.124.
- TABER B. E., MACDONALD D. W. (1984). "Scent dispersing papillae and associated behaviour in the mara, Dolichotis patagonum (Rodentia: Caviomorpha)". Journal of Zoology 203: 298–301.
- Charles Fergus (1 September 2000). Wildlife of Pennsylvania: And the Northeast. Stackpole Books. pp. 75–. ISBN 978-0-8117-2899-7. Retrieved 31 March 2013.
- Uldis Roze (28 September 2012). Porcupines: The Animal Answer Guide. JHU Press. pp. 97–. ISBN 978-1-4214-0735-7. Retrieved 31 March 2013.
- Marshall Cavendish (2007). EXPLORING MAMMALS. Marshall Cavendish. pp. 1088–. ISBN 978-0-7614-7719-8. Retrieved 31 March 2013.
- Donna Naughton (2012). A Natural History of Canadian Mammals. University of Toronto Press. pp. 214–. ISBN 978-1-4426-4483-0. Retrieved 31 March 2013.
- Trevor Carnaby (30 January 2008). Beat About the Bush: Mammals. Jacana Media. ISBN 978-1-77009-240-2. Retrieved 21 May 2013.
- Richard Estes (1991). The Behavior Guide to African Mammals: Including Hoofed Mammals, Carnivores, Primates. University of California Press. ISBN 978-0-520-08085-0.
- "Flehmening". ASPCA. Retrieved 2012-05-23.
- "The Natural Horse and Unnatural Behaviour." Reproduced with permission from the Proceedings of the BEVA Specialist Days on Behaviour and Nutrition. Ed. P.A.Harris et al. Pub. Equine Veterinary Journal Ltd. Web site accessed June 22, 2007 at Effem-Equine.com
- "Cut Through Smegma." Horse Journal, August, 2007, p. 19-20.
- Palagi, E.; Dapporto, L.; Borgognini-Tarli, S.M. (2005). "The neglected scent: on the marking function of urine in Lemur catta" (PDF). Behavioral Ecology and Sociobiology 58: 437–445. doi:10.1007/s00265-005-0963-1.
- Palagi, E.; Dapporto, L. (2006). "Urine marking and urination in Lemur catta: a comparison of design features" (PDF). Annales Zoologici Fennici 43: 280–284.
- Palagi, E.; Norscia, I. (2005). "Multimodal signaling in wild Lemur catta: Economic design and territorial function of urine marking". American Journal of Physical Anthropology 139: 182–192. doi:10.1002/ajpa.20971.
- Fragaszy, D., Visalberghi, E., & Fedigan, L. (2004). "The Body". The Complete Capuchin. Cambridge University Press. p. 102. ISBN 0-521-66768-2.
- Defler, T. (2004). Primates of Colombia. Conservation International. pp. 252–266. ISBN 1-881173-83-6.
- Mittermeier, Rylands & Konstant 1999, pp. 5 & 26.
- Kruuk 1972, p. 274
- Kruuk 1972, p. 210
- Szykman. M., Van Horn, R. C., Engh, A.L. Boydston, E. E. & Holekamp, K. E. (2007) Courtship and mating in free-living spotted hyenas. Behaviour. 144: 815–846.
- Fox, M. W. (1984). The Whistling Hunters: Field Studies of the Indian Wild Dog (Cuon Alpinus). Steven Simpson Books. ISBN 0-9524390-6-9.)
- Sillero-Zubiri, Claudio; Hoffmann, Michael; Macdonald, David Whyte (2004). Canids: Foxes, Wolves, Jackals, and Dogs : Status Survey and Conservation Action Plan. IUCN. p. 74. ISBN 978-2-8317-0786-0. Retrieved 17 October 2013.
- Apps, Peter (2000). Wild Ways: Field Guide to the Behaviour of Southern African Mammals. Struik. p. 87. ISBN 978-1-86872-443-7. Retrieved 17 October 2013.
- Grzimek, Bernhard (1972). Grzimek's Animal life encyclopedia. Van Nostrand Reinhold Co. Retrieved 17 October 2013.
- Coren, Stanley (5 January 2006). The Intelligence of Dogs: A Guide to the Thoughts, Emotions, and Inner Lives of Our Canine Companions. Atria Books. p. 36. ISBN 978-0-7432-8087-7. Retrieved 17 October 2013.
- Evans, Jonah Wy (11 February 2012). Field Guide to Animal Tracks and Scat of California. University of California Press. ISBN 978-0-520-25378-0. Retrieved 17 October 2013.
- Coren, Stanley (5 January 2006). The Intelligence of Dogs: A Guide to the Thoughts, Emotions, and Inner Lives of Our Canine Companions. Atria Books. ISBN 978-0-7432-8087-7. Retrieved 17 October 2013.
- Case, Linda P. (2010). Canine and Feline Behavior and Training: A Complete Guide to Understanding our Two Best Friends: A Complete Guide to Understanding Our Two Best Friends. Cengage Learning. pp. 46–. ISBN 978-1-4283-1053-7.
- Wyatt, Tristram D. (27 February 2003). Pheromones and Animal Behaviour: Communication by Smell and Taste. Cambridge University Press. p. 99. ISBN 978-0-521-48526-5. Retrieved 17 October 2013.
- Serpell, James (21 September 1995). The Domestic Dog: Its Evolution, Behaviour and Interactions with People. Cambridge University Press. p. 120. ISBN 978-0-521-42537-7. Retrieved 17 October 2013.
- Coile, D. Caroline; Bonham, Margaret H. (2008). Why Do Dogs Like Balls?: More Than 200 Canine Quirks, Curiosities, and Conundrums Revealed. Sterling Publishing Company, Inc. ISBN 978-1-4027-5039-7. Retrieved 17 October 2013.
- Peters, Roger (1980). Mammalian Communication: A Behavioral Analysis of Meaning. Brooks/Cole Publishing Company. ISBN 978-0-8185-0388-7. Retrieved 17 October 2013.
- Goodmann, Patricia A.; Klinghammer, Erich; Sloan, Monty (1990). Wolf ethogram. North American Wildlife Park Foundation. Retrieved 17 October 2013.
- Horowitz, Alexandra (28 September 2010). Inside of a Dog: What Dogs See, Smell, and Know. Scribner. p. 116. ISBN 978-1-4165-8343-1.
- Bekoff, Marc (2006). Animal Passions and Beastly Virtues: Reflections on Redecorating Nature. Temple University Press. p. 112. ISBN 978-1-59213-349-9. Retrieved 17 October 2013.
- Fox, Michael W. (2007). Dog Body, Dog Mind: Exploring Canine Consciousness and Total Well-Being. Globe Pequot. p. 26. ISBN 978-1-59921-661-4. Retrieved 17 October 2013.
- L. David Mech; Luigi Boitani (1 October 2010). Wolves: Behavior, Ecology, and Conservation. University of Chicago Press. p. 85. ISBN 978-0-226-51698-1. Retrieved 23 February 2013.
- "Urine Marking in Dogs: Why do Dogs Urinate to Mark Territory?". Pets.webmd.com. Retrieved 2012-11-20.
- The Wolves of Minnesota: Howl in the Heartland - L. David Mech - Google Books. Books.google.com. Retrieved 2012-11-20.
- Wolves: Behavior, Ecology, and Conservation - Google Books. Books.google.com. 2003-11-23. Retrieved 2012-11-20.
- Field Guide to Mammal Tracking in North America - James C. Halfpenny, Elizabeth Biesiot - Google Books. Books.google.com. Retrieved 2012-11-20.
- Mech & Boitani 2003, pp. 80–86
- Partha P. Majumder (1993). Human population genetics: a centennial tribute fo J.B.S. Haldane. Plenum Press. ISBN 978-0-306-44572-9. Retrieved 23 February 2013.
- Cambridge Scientific Abstracts, Inc (1986). Chemoreception Abstracts. Washington. Retrieved 22 March 2013.
- Meredith F. Small (1986). Zoo biology. ISBN 978-0-8451-3403-0. Retrieved 22 March 2013.
- Jane Williams (RCVS.) (16 June 2009). The complete textbook of animal health and welfare. Saunders/Elsevier. ISBN 978-0-7020-2944-8. Retrieved 22 March 2013.
- David W. Macdonald; Claudio Sillero-Zubiri (24 June 2004). The Biology and Conservation of Wild Canids. Oxford University Press. ISBN 978-0-19-152335-9. Retrieved 22 March 2013.
- Steven R. Lindsay (9 January 2008). Handbook of Applied Dog Behavior and Training, Procedures and Protocols. John Wiley & Sons. pp. 512–. ISBN 978-0-470-34413-2. Retrieved 22 March 2013.
- Durward Leon Allen (1979). Wolves of Minong: Isle Royal's Wild Community. University of Michigan Press. pp. 282–. ISBN 978-0-472-08237-7. Retrieved 21 March 2013.
- Animal Behaviour Abstracts. Cambridge Scientific Abstracts. 1998. Retrieved 22 March 2013.
- Ecology Abstracts. Cambridge Scientific Abstracts. 1998. Retrieved 22 March 2013.
- David Moskowitz (19 May 2010). Wildlife of the Pacific Northwest: Tracking and Identifying Mammals, Birds, Reptiles, Amphibians, and Invertebrates. Timber Press. pp. 221–. ISBN 978-0-88192-949-2. Retrieved 21 March 2013.
- Dietland Müller-Schwarze; Robert Milton Silverstein (1980). Chemical signals: vertebrates and aquatic invertebrates. Plenum Press. ISBN 978-0-306-40339-2. Retrieved 22 March 2013.
- Joanne Mattern (1 August 1999). The Coyote. Capstone. pp. 21–. ISBN 978-0-7368-8485-3. Retrieved 25 February 2013.
- Field Guide to Mammal Tracking in North America - James C. Halfpenny - Google Books. Books.google.com. Retrieved 2012-11-30.
- Hope Ryden (2005-05-30). God's Dog: A Celebration of the North American Coyote. Books.google.com. Retrieved 2013-02-10.
- Elbroch, Lawrence Mark; Kresky, Michael Raymond; Evans, Jonah Wy (2012-02-11). "Field Guide to Animal Tracks and Scat of California". ISBN 9780520253780.
- Young & Jackson 1978, p. 98
- "Journal of Ethology, November 2012, John K. Fawcett, Jeanne M. Fawcett, Carl D. Soulsbury". Link.springer.com. 2013-01-01. Retrieved 2013-02-10.
- MacDonald, D. W. (2010). "Some Observations and Field Experiments on the Urine Marking Behaviour of the Red Fox, Vulpes vulpes L". Zeitschrift für Tierpsychologie 51: 1–0. doi:10.1111/j.1439-0310.1979.tb00667.x.
- Jorgenson, J. W.; Novotny, M.; Carmack, M.; Copland, G. B.; Wilson, S. R.; Katona, S.; Whitten, W. K. (1978). "Chemical Scent Constituents in the Urine of the Red Fox (Vulpes vulpes L.) During the Winter Season". Science 199 (4330): 796–798. doi:10.1126/science.199.4330.796. PMID 17836296.
- Whitten, W. K.; Wilson, M. C.; Wilson, S. R.; Jorgenson, J. W.; Novotny, M.; Carmack, M. (1980). "Induction of marking behavior in wild red foxes (Vulpes vulpes L.) by synthetic urinary constituents". Journal of Chemical Ecology 6: 49. doi:10.1007/BF00987526.
- Harrington, Fred H. (1981). "Urine-Marking and Caching Behavior in the Wolf". Behaviour 76 (3/4): 280–288. doi:10.1163/156853981X00112. JSTOR 4534102.
- Walters, Martin; Bang, Preben; Dahlstrøm, Preben (2001). Animal tracks and signs. Oxford: Oxford University Press. pp. 202–3. ISBN 0-19-850796-8.
- Lawrence Mark Elbroch, Michael Raymond Kresky, Jonah Wy Evans. Field Guide to Animal Tracks and Scat of California. Books.google.com. Retrieved 2013-02-10.
- Macdonald 1987, p. 125
- Henry, J. David (1977). "The Use of Urine Marking in the Scavenging Behavior of the Red Fox (Vulpes vulpes)". Behaviour 61 (1/2): 82–106. doi:10.1163/156853977X00496. JSTOR 4533812.
- Andersen, K. F.; Vulpius, T. (1999). "Urinary volatile constituents of the lion, Panthera leo". Chemical Senses 24 (2): 179–189. doi:10.1093/chemse/24.2.179. PMID 10321819.
- Lawrence Mark Elbroch; Michael Raymond Kresky; Jonah Wy Evans (11 February 2012). Field Guide to Animal Tracks and Scat of California. University of California Press. pp. 189–. ISBN 978-0-520-25378-0. Retrieved 3 December 2012.
- Andrew Solway (2005). Wolves and Other Dogs. Heinemann Library. p. 36. ISBN 978-1-4034-5775-2. Retrieved 2012-11-20.
- Claudio Sillero-Zubiri; Michael Hoffmann; David Whyte Macdonald (2004). Canids: Foxes, Wolves, Jackals, and Dogs : Status Survey and Conservation Action Plan. IUCN--The World Conservation Union. p. 79. ISBN 978-2-8317-0786-0. Retrieved 2012-11-30.
- Claudio Sillero-Zubiri (28 July 2004). Canids: Foxes, Wolves, Jackals And Dogs: Status Survey And Conservation Action Plan. IUCN. pp. 79–. ISBN 978-2-8317-0786-0. Retrieved 10 February 2013.
- Cristian Frers. "Un lobo de crin llamado Aguará Guazú". Retrieved 2007-04-23.
- Brian Switek (2011-03-10). "Maned Wolf Pee Demystified". Wired. Retrieved 2011-06-05.
- Süddeutsche Zeitung, 2006-09-02, p3
- Reena Mathur (2010). Animal Behaviour 3/e. Rastogi Publications. ISBN 978-81-7133-747-7. Retrieved 10 February 2013.
- R. F. Ewer (1973). The Carnivores. Cornell University Press. pp. 116–. ISBN 978-0-8014-8493-3. Retrieved 8 February 2013.
- John W. S. Bradshaw; Rachel A. Casey; Sarah L. Brown (31 January 2013). The Behaviour of the Domestic Cat. CABI. pp. 104–. ISBN 978-1-78064-120-1. Retrieved 22 March 2013.
- Stefan Schulz (17 March 2005). The Chemistry of Pheromones and Other Semiochemicals II. Springer. pp. 249–. ISBN 978-3-540-21308-6. Retrieved 22 March 2013.
- John Seidenstic (1996). Tigers. MBI Publishing Company. pp. 63–. ISBN 978-0-89658-295-8. Retrieved 25 December 2012.
- Burger, B. V.; Viviers, M. Z.; Bekker, J. P. I.; Roux, M.; Fish, N.; Fourie, W. B.; Weibchen, G. (2008). "Chemical Characterization of Territorial Marking Fluid of Male Bengal Tiger, Panthera tigris". Journal of Chemical Ecology 34 (5): 659–671. doi:10.1007/s10886-008-9462-y. PMID 18437496.
- Schaller, George B (2009-10-15). "The Serengeti Lion: A Study of Predator-Prey Relations". ISBN 9780226736600.
- George B. Schaller (15 October 2009). The Serengeti Lion: A Study of Predator-Prey Relations. University of Chicago Press. pp. 115–. ISBN 978-0-226-73660-0. Retrieved 9 May 2013.
- Cheetahs (Revised Edition) - Dianne M. MacMillan - Google Books. Books.google.com. Retrieved 2012-11-20.
- T. M. Caro (15 August 1994). Cheetahs of the Serengeti Plains: Group Living in an Asocial Species. University of Chicago Press. pp. 203–. ISBN 978-0-226-09433-5. Retrieved 21 March 2013.
- Sunquist, M.; Sunquist, F. (2002). Wild cats of the World. Chicago: University of Chicago Press. pp. 76–82. ISBN 0-226-77999-8.
- Young, S. P.; Jackson, H. H. T. (1978). The Clever Coyote. University of Nebraska Press. ISBN 0-8032-5893-3.
- Mech, L. David; Boitani, Luigi (2003). Wolves: Behaviour, Ecology and Conservation. University of Chicago Press. ISBN 0-226-51696-2.
|Look up urination in Wiktionary, the free dictionary.|
- Media related to Urination at Wikimedia Commons
- Neurogenic Bladder at eMedicine, describes the neurophysiology of urination
- "Urination" at HowStuffWorks.com