Mammals are warm blooded air breathing animals that either have fur or just skin

Land mammals

Most of the mammals in the world are land mammals like dogs, cats, bats, and even more but they aren't the biggest if you want to see the biggest mammal go to the section water mammals also some land mammals lay eggs because there crazy cool

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Water mammals

Water mammals are the mammals that live in the ocean like dolphins and whales the blue whales it the biggest animal and mammal in the world I think they are will cool.

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Flying mammals

Bats are the worlds only flying mammal they eat meat and eat plant their are only a couple of kinds of bats some are really small but some are big.