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Cheek pouches are pockets on both sides of the head of some mammals between the jaw and the cheek. They can be found on mammals including the platypus, some rodents, and most monkeys, [1] [2] as well as the marsupial koala. [3] The cheek pouches of chipmunks can reach the size of their body when full.
Egg cases are made of collagen protein strands, [4] and are often described as feeling rough and leathery. [5] Some egg cases have a fibrous material covering the outside of the egg case, thought to aid in attachment to substrate. [1] [6] Egg cases without a fibrous outer layer can be striated, bumpy, or smooth and glossy.
Most waterskins could hold between 18 and 27.5 L (5 and 7 US gallons; 4 and 6 imperial gallons) of water. [1] The disadvantage of waterskins is that people who have fetched water in the skin bottle and who have drunk water from the same have complained of the water taking on the bad taste of the goatskin. [4]
The concentration of oxygen in water is lower than air and it diffuses more slowly. In a litre of freshwater the oxygen content is 8 cm 3 per litre compared to 210 in the same volume of air. [7] Water is 777 times more dense than air and is 100 times more viscous. [7] Oxygen has a diffusion rate in air 10,000 times greater than in water. [7]
Fur-lined cheek pouches are a feature across the family Heteromyidae. They have openings near the mouth and extend backwards along the sides of the neck. The fur on the animal's body is in general short and fine and often matches in colour the soil of the region in which the animal lives, being some shade of buff, pale brown, reddish-brown or grey.
Instead, the gills are contained in spherical pouches, with a circular opening to the outside. Like the gill slits of higher fish, each pouch contains two gills. In some cases, the openings may be fused together, effectively forming an operculum. Lampreys have seven pairs of pouches, while hagfishes may have six to fourteen, depending on the ...
Locomotive kangaroos have a pouch opening at the front, while many others that walk or climb on all fours have the opening in the back. Usually, only females have a pouch, but the male water opossum has a pouch that is used to accommodate his genitalia while swimming or running.
A recent study indicates that remains of marsupial moles have been found in 5% of the cats and foxes faecal pellets examined. [19] Moles are also sensitive to changes in the availability of their food caused by changing fire regimes and the impact of herbivores.