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Okay, I'm guessing the questioner is young.

Mammals are covered with skin and hair, fish are covered with small scales, and birds have skin and feathers.

Mammals have live births, whereas fish and birds lay eggs.

Mammals and birds are warm blooded and can regulate their own body temperature, whereas fish are cold blooded and regulate to the water around them.

Mammals and fish have teeth; birds do not.

Birds can fly because their bones are hollow to help them move through the air; fish have gills to help them breathe underwater and mammals are basically land animals, with the exceptions of the whale and dolphin.

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Loma Schowalter

Lvl 13
3y ago

What else can I help you with?