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The terms animal testing, animal experimentation, animal research, in vivo testing, and vivisection have similar denotations but different connotations.Literally, "vivisection" means "live sectioning" of an animal, and historically referred only to experiments that involved the dissection of live animals.
Playfulness by Paul Manship. Play is a range of intrinsically motivated activities done for recreation. [1] Play is commonly associated with children and juvenile-level activities, but may be engaged in at any life stage, and among other higher-functioning animals as well, most notably mammals and birds.
However, the most kept pet species are mammals, namely dogs, cats, and rabbits. [191] [192] [193] There is a tension between the role of animals as companions to humans, and their existence as individuals with rights of their own. [194] A wide variety of terrestrial and aquatic animals are hunted for sport. [195]
Jerry Allen Coyne (born December 30, 1949) [4] [5] is an American biologist and skeptic known for his work on speciation and his commentary on intelligent design.A professor emeritus at the University of Chicago in the Department of Ecology and Evolution, he has published numerous papers on the theory of evolution.
While the early amniotes resembled their amphibian ancestors in many respects, a key difference was the lack of an otic notch at the back margin of the skull roof. In their ancestors, this notch held a spiracle , an unnecessary structure in an animal without an aquatic larval stage. [ 25 ]
Animals feature in many different roles in video games, ranging from background NPCs and basic enemies to the protagonist of a game, as in the 2022 game Stray. [66] Virtual pet video games, such as the Nintendogs series and the mobile game Neko Atsume, are a popular type of game where the player cares for a fictional pet, usually a dog or cat. [67]
Herpetology (from Greek ἑρπετόν herpetón, meaning "reptile" or "creeping animal") is a branch of zoology concerned with the study of amphibians (including frogs, salamanders, and caecilians (Gymnophiona)) and reptiles (including snakes, lizards, turtles, crocodilians, and tuataras).
The resemblance between the crocodilians and phytosaurs in particular is quite striking; even to the point of having evolved the graduation between narrow- and broad-snouted forms, due to differences in diet between particular species in both groups. [88] Death adders strongly resemble true vipers, but are elapids. [89]