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A yawn is a reflex in vertebrate animals characterized by a long inspiratory phase with gradual mouth gaping, followed by a brief climax (or acme) with muscle stretching, and a rapid expiratory phase with muscle relaxation, which typically lasts a few seconds.
Characteristic "yawn" of a hippo. The hippo's jaw is powered by huge masseter and digastric muscles which give them large, droopy cheeks. [39]: 259 The jaw hinge allows the animal to open its mouth at almost 180°. [7]: 17 A folded orbicularis oris muscle allows the hippo to attain an extreme gape without tearing any tissue. [41]
The animal had a stiff tail and could open its jaws to an unusual extent. Recent studies and anecdotal evidence on its predatory behaviour suggest that the thylacine was a solitary ambush predator specialised in hunting small- to medium-sized prey. Accounts suggest that, in the wild, it fed on small birds and mammals.
Yawning is also phylogenetically preserved, meaning it occurs in many different animal species including mammals, birds, reptiles, amphibians, and fish, Epstein adds. Why do I yawn when I’m bored?
The yacare caiman (Caiman yacare), also known commonly as the jacare caiman, Paraguayan caiman, piranha caiman, red caiman, [5] and southern spectacled caiman, [6] is a species of caiman, a crocodilian in the family Alligatoridae.
If any animal has a system of laws regulating the body politic, it is certainly the prairie dog." [57] "Dog Town" or settlement of prairie dogs, from Commerce of the Prairies. From Josiah Gregg's journal, Commerce of the Prairies: "Of all the prairie animals, by far the most curious, and by no means the least celebrated, is the little prairie ...
A new year means more viral moments of animals being animals. From Florida alligators and Oregon black bears to a Massachusetts great white shark, 2024 proved to be a big year for ferocious animal ...
Howler monkeys are widely considered to be the loudest land animals. According to Guinness Book of World Records , their vocalizations can be heard clearly for 3 mi (4.8 km). [ 11 ] The function of howling is thought to relate to intergroup spacing and territory protection, as well as possibly to mate-guarding.