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Hace 3 horas · Aves (birds) See text for extinct groups. Reptiles, as commonly defined, are a group of tetrapods with an ectothermic ('cold-blooded') metabolism and amniotic development. Living reptiles comprise four orders: Testudines ( turtles ), Crocodilia ( crocodilians ), Squamata ( lizards and snakes ), and Rhynchocephalia (the tuatara ).
Hace 1 día · The beluga whale (/ b ɪ ˈ l uː ɡ ə /; Delphinapterus leucas) is an Arctic and sub-Arctic cetacean.It is one of two members of the family Monodontidae, along with the narwhal, and the only member of the genus Delphinapterus.It is also known as the white whale, as it is the only cetacean to regularly occur with this colour; the sea canary, due to its high-pitched calls; and the melonhead ...
