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Birds are warm-blooded like mammals and lay eggs as some mammals do. But mammals are characterized as nursing their young, which no birds do (although some male penguins have a way of feeding newborns).

Birds are also different from most mammals in these ways:

1) Birds have wings, although some can't fly (penguins, emus, ostriches)

2) They have feathers to aid with flying and waterproofing. Most mammals have fur or hair all over their body.

3) They lay eggs which are fertilized inside of the females (the eggs come out in the same form whether fertilized or not).

4) They have hollow bones whereas mammals have filled bones.

5) Most have a beak or a bill of some kind.

6) The shape of the body: most often a teardrop-shaped body and a long neck with two legs. Most mammals have four limbs with paws or feet to walk on.

7) Most birds have claws and a three-toed foot with the extra toe at the back.

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11y ago

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