Bird Generally speaking a bird is any member of the class known as Aves that share certain common characteristics and traits. Birds are warm-blooded, bipedal animals whose anatomy is characterized by forelimbs modified through natural selection and evolution to become wings, whose exterior is covered by feathers, and that have, in most cases, hollow bones to assist in flight.
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Animals Collection This app is a part of the 4-book series on animals, life sciences, biology SAT prep, and biology advanced placement