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Is a bird a mammal?

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The chordates are dominated by the vertebrates (animals with backbones), which consist of fishes, amphibians, reptiles, birds, and mammals. read more

The characteristics shared by animals within the Aves (bird) class are different to those shared by the animals in the Mammalia (mammal) class. This, in a nutshell, is why a bird is not a mammal. However, there is some overlap between the characteristics of birds and mammals. read more

Mammals have an outer covering of skin, fur or hair, while birds have a covering of feathers. With the exception of the two monotremes, the platypus and echidna, mammals gve birth to live young, whereas all birds lay eggs. All mammals (including the monotremes) nurture their young on mothers' milk. read more

Birds are neither mammals (they don't have mammary glands) nor reptiles (they are not cold blooded), but instead belong in a grouping all their own. The bird group is one of six basic animal groups, with the others being amphibians, fish, invertebrates, mammals and reptiles. read more

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