Tetrapod

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Tetrapods (Greek τετραποδη tetrapodē, equivalent to Latin quadruped, "four-footed") are vertebrate animals having four limbs. Amphibians, reptiles, birds, and mammals are all tetrapods, and even snakes and other limbless reptiles and amphibians are tetrapods by descent. The earliest tetrapods evolved from the lobe-finned fishes in the Devonian.[1] They are now a dominant part of the terrestrial fauna, representing all known larger land animals. Some groups have even returned to an aquatic existence, including the largest animal known, the blue whale.

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