The origin of four-limbed animals known as tetrapods was thought to be fairly straightforward: Fish flopped onto land in the Devonian, evolved, and eventually diversified into the reptiles, birds, ...
Long dismissed as unintelligent, reptiles are emerging as cognitively and emotionally complex animals. A new study involving tortoises suggests that they also possess mood states. By Brandon Keim ...
Reptiles, as commonly defined, are tetrapod vertebrate animals with an ectothermic metabolism and amniotic development. Reptiles traditionally comprise four orders: Testudines (turtles), Crocodilia (crocodiles, alligators and gharials), Squamata (lizards and snakes) and Rhynchocephalia (tuatara), with about 12,000 extant species listed in the Reptile Database. [2] The study of the traditional ...
Reptiles are cold-blooded (ectothermic) vertebrates of the class Reptilia, which includes turtles, crocodilians, lizards, and snakes. They use their four limbs (tetrapods) for locomotion and reproduce by laying amniotic eggs, in which the embryo is suspended in amniotic fluid and covered by an amniotic sac to prevent desiccation.
During the Mesozoic (245-65 million years ago) this group, including dinosaurs and other reptiles, dominated life on all continents and in the oceans. Most or all of crocodilians' adaptations had already evolved by the late Triassic (about 200 million years ago).
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