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to breastfeed successfully. One study of women with inverted or non-protractile nipples found no statistically significant difference in breastfeeding...

and the profile a straight line from dorsal fin to mouth. The mouth is protractile, and the lower jaw juts out. Sizes are fairly small, typically up to...

This led some to think that the upper jaw of Squalus would not be as protractile as the jaws of other sharks. However, a study that compared different...

with sandy bottoms, feeding pits can be seen during daytime. The fish's protractile mouth helps it dig for chironomid larvae, Tubifex worms, bivalves, and...

ventral and dorsal surfaces. The mouth is large, crescent-shaped and protractile, with the upper lip continuous while the lower lip is interrupted by...

phalanges of the paws and are made of keratin. Many predatory mammals have protractile claws that can partially hide inside the animal's paw, especially the...

pikes and their relatives, as they share some features: a flat head with protractile mouth beset with cardiform, villiform, or compressed, bi- or tricuspid...

covered in well-defined scales. The mouth is also usually not truly protractile. The largest characins are Hydrocynus goliath and Salminus franciscanus...

species have a tubular snout. The mouth is very small and is with non protractile jaws which have one row of compressed, closely set, incisor-like teeth...

and only 1 spine in the pelvic fins. The upper part of the mouth is protractile, allowing them to snatch up little fishes, copepods, amphypods, shrimp...

exclusively on plankton by picking out individual food items with their protractile mouths. Both sexes mouthbrood although up to 6 mm (0.24 in) in length...

on their forefeet and four on their hind feet. Their curved claws are protractile and attached to the terminal bones of the toe with ligaments and tendons...

cats have to break the surface with their toes due to their claws being protractile. Still, on rare occasions outdoor cats have been observed trying to dig...

that appears to have evolved to resemble dead leaves, and very large protractile mouths. Those features, along with their peculiar movements (seemingly...

creature. Adults lack that plating, and, as other oreos, they have a protractile mouth and very large eyes, with small scales. This species grows to a...

larger objects including sharks and jellyfish. The species uses its protractile jaws to suck out prey from the sand or reef, and consumes a variety of...

Thalassoma Wetmorella Xenojulis Xiphocheilus Xyrichtys Wrasses have protractile mouths, usually with separate jaw teeth that jut outwards. Many species...

attached to the ethmoid and palatine, slides in and out with the highly protractile premaxilla. The pelvic fins have up to 17 rays and are placed rather...

snout which is shorter than the diameter of the eye and a terminal, protractile mouth. The oval eyes are placed at the top of the head and have a diameter...

colourful, indicating breeding for the pet trade. The mouth is large and protractile, and both upper and lower jaws have tiny teeth for eating fishes, worms...