A mammal is any animal that feeds its young with milk and is warm-blooded; the heat they need to live is made inside their body. The milk is made by glands in the skin.

Most give birth to living young, but there are only a very few kinds that hatch eggs, for example the platypus. Most mammals have four legs and a coat of hair or fur.

Mammals can be divided in a number of groups:

• carnivores (meat-eaters like cats, dogs, and bears)
• mustelids
• ungulates
• pinnipeds

See also: Mammalia (taxonomy)

Animals | Mammals

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