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No, a bird is not a mammal because it lays eggs, it metabolizes nutrients differently, they have a different digestive tract, and they have lighter bones.

Actually you should ignore the fact that a bird lays eggs. A platypus lays eggs and is a mammal, however, a bird is not a mammal because a mammal feeds its young milk.

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โˆ™ 2015-03-07 08:05:10
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โˆ™ 2015-03-07 08:04:47

No, a bird is not a mammal. Although both birds and mammals are warm-blooded vertebrates, mammals are in the class Mammalia and birds are in the class Aves. Differences between the two include the following:

  • 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.
  • All modern birds, even the flightless ones, have wings, whereas the only truly flighted mammal is the bat.
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