Are birds reptiles or mammals?

Birds are not mammals (they lack mammary glands) or reptiles (they are not cold-blooded), but rather belong to a separate group. Birds are one of six basic animal groups, with amphibians, fish, invertebrates, mammals, and reptiles being the others.

Aside from possessing feathers, birds have a variety of different traits. Birds have a four-chambered heart and a rapid metabolic rate. They have light bones and lay eggs. Birds are thought to have evolved roughly 150 million years ago during the Mesozoic Era, and there are presently over 9,000 bird species worldwide.

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