Lake duck: Difference between revisions

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The Lake Duck occurs in [[Argentina]], [[Chile]], [[Paraguay]], and [[Brazil]] in southern South America.<ref name=iucn/>
The Lake Duck occurs in [[Argentina]], [[Chile]], [[Paraguay]], and [[Brazil]] in southern South America.<ref name=iucn/>


It is notable for possessing, in relation to body length, the [[largest body part|longest]] [[penis]] of all [[vertebrates]]; the penis, which is coiled up in flaccid state, can reach about the same length as the animal itself when fully erect, but more commonly is about half the bird's length.<ref>{{cite journal|last=McCracken|first= Kevin G. |year=2000|title=The 20-cm Spiny Penis of the Argentine Lake Duck (''Oxyura vittata'')|journal=[[The Auk]] |volume=117|issue=3|pages=820–825|url=http://mercury.bio.uaf.edu/~kevin_mccracken/reprints/auk-117-820.pdf |format=PDF}}</ref><ref>{{cite journal|last=McCracken|first=Kevin G. |first2=Robert E.|last2= Wilson|first3=Pamela J. |last3=McCracken|first4=Kevin P. |last4=Johnson|year=2001|title=Sexual selection: Are ducks impressed by drakes' display?|journal=[[Nature (journal)|Nature]] |volume=413|page=128|doi=10.1038/35093160 |url=http://mercury.bio.uaf.edu/~kevin_mccracken/reprints/nature-413-128.pdf|format= PDF}}</ref> It is theorized that the remarkable size of the spiny penis with its bristled tip may have evolved in response to competitive pressure in these highly promiscuous birds, removing sperm from previous matings in the manner of a [[brush|bottle brush]].
It is the weirdest duck ever but i still have to do a project on it. It is notable for possessing, in relation to body length, the [[largest body part|longest]] [[penis]] of all [[vertebrates]]; the penis, which is coiled up in flaccid state, can reach about the same length as the animal itself when fully erect, but more commonly is about half the bird's length.<ref>{{cite journal|last=McCracken|first= Kevin G. |year=2000|title=The 20-cm Spiny Penis of the Argentine Lake Duck (''Oxyura vittata'')|journal=[[The Auk]] |volume=117|issue=3|pages=820–825|url=http://mercury.bio.uaf.edu/~kevin_mccracken/reprints/auk-117-820.pdf |format=PDF}}</ref><ref>{{cite journal|last=McCracken|first=Kevin G. |first2=Robert E.|last2= Wilson|first3=Pamela J. |last3=McCracken|first4=Kevin P. |last4=Johnson|year=2001|title=Sexual selection: Are ducks impressed by drakes' display?|journal=[[Nature (journal)|Nature]] |volume=413|page=128|doi=10.1038/35093160 |url=http://mercury.bio.uaf.edu/~kevin_mccracken/reprints/nature-413-128.pdf|format= PDF}}</ref> It is theorized that the remarkable size of the spiny penis with its bristled tip may have evolved in response to competitive pressure in these highly promiscuous birds, removing sperm from previous matings in the manner of a [[brush|bottle brush]].


Although most male birds have no penis,<ref>[http://www.abc.net.au/science/articles/2001/09/14/366856.htm?topic=enviro Found! The longest bird penis ever › News in Science (ABC Science)<!-- Bot generated title -->]</ref> ducks have a long corkscrew penis, and the females have a long corkscrew vagina, which spirals in the opposite direction.<ref>[http://www.cosmosmagazine.com/node/1277 Duck genitals locked in arms race | COSMOS magazine<!-- Bot generated title -->]</ref> The males often try to force copulation, but the complex mating geometry allows the females to retain control—most of the forced copulations do not result in successful fertilisation.<ref>{{cite journal|first=Patricia L. R.|last=Brennan|coauthors=Prum, Richard O.; McCracken, Kevin G.; Sorenson, Michael D.; Wilson, Robert E.; Birkhead, Tim R.|date=2 May 2007|title=Coevolution of Male and Female Genital Morphology in Waterfowl|journal=PLoS ONE|volume=2|issue=5|pages=e418|doi=10.1371/journal.pone.0000418}}</ref>
Although most male birds have no penis,<ref>[http://www.abc.net.au/science/articles/2001/09/14/366856.htm?topic=enviro Found! The longest bird penis ever › News in Science (ABC Science)<!-- Bot generated title -->]</ref> ducks have a long corkscrew penis, and the females have a long corkscrew vagina, which spirals in the opposite direction.<ref>[http://www.cosmosmagazine.com/node/1277 Duck genitals locked in arms race | COSMOS magazine<!-- Bot generated title -->]</ref> The males often try to force copulation, but the complex mating geometry allows the females to retain control—most of the forced copulations do not result in successful fertilisation.<ref>{{cite journal|first=Patricia L. R.|last=Brennan|coauthors=Prum, Richard O.; McCracken, Kevin G.; Sorenson, Michael D.; Wilson, Robert E.; Birkhead, Tim R.|date=2 May 2007|title=Coevolution of Male and Female Genital Morphology in Waterfowl|journal=PLoS ONE|volume=2|issue=5|pages=e418|doi=10.1371/journal.pone.0000418}}</ref>

Revision as of 18:00, 3 November 2011

Lake Duck
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Aves
Order:
Anseriformes
Family:
Anatidae
Subfamily:
Oxyurinae
Genus:
Oxyura
Species:
O. vittata
Binomial name
Oxyura vittata
(Philippi, 1860)
Females

The Lake Duck (Oxyura vittata) is a small South American stiff-tailed duck. It is also called the or Argentine Blue-bill, Argentine Lake Duck, or Argentine Ruddy Duck.

The Lake Duck occurs in Argentina, Chile, Paraguay, and Brazil in southern South America.[1]

It is the weirdest duck ever but i still have to do a project on it. It is notable for possessing, in relation to body length, the longest penis of all vertebrates; the penis, which is coiled up in flaccid state, can reach about the same length as the animal itself when fully erect, but more commonly is about half the bird's length.[2][3] It is theorized that the remarkable size of the spiny penis with its bristled tip may have evolved in response to competitive pressure in these highly promiscuous birds, removing sperm from previous matings in the manner of a bottle brush.

Although most male birds have no penis,[4] ducks have a long corkscrew penis, and the females have a long corkscrew vagina, which spirals in the opposite direction.[5] The males often try to force copulation, but the complex mating geometry allows the females to retain control—most of the forced copulations do not result in successful fertilisation.[6]

References

  1. ^ a b Template:IUCN
  2. ^ McCracken, Kevin G. (2000). "The 20-cm Spiny Penis of the Argentine Lake Duck (Oxyura vittata)" (PDF). The Auk. 117 (3): 820–825.
  3. ^ McCracken, Kevin G.; Wilson, Robert E.; McCracken, Pamela J.; Johnson, Kevin P. (2001). "Sexual selection: Are ducks impressed by drakes' display?" (PDF). Nature. 413: 128. doi:10.1038/35093160.
  4. ^ Found! The longest bird penis ever › News in Science (ABC Science)
  5. ^ Duck genitals locked in arms race | COSMOS magazine
  6. ^ Brennan, Patricia L. R. (2 May 2007). "Coevolution of Male and Female Genital Morphology in Waterfowl". PLoS ONE. 2 (5): e418. doi:10.1371/journal.pone.0000418. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)CS1 maint: unflagged free DOI (link)

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