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Fact file

Mammals Proper name: Phylum Chordata, Class Mammalia
Common name: Mammals
Examples: Mice, lions, monkeys, whales, humans

Numbers of species: About 5,000
Where they are found: On land, in the oceans, and in freshwater

Description: Mammals' bodies are covered in fur. Most mammals give birth to small numbers of live young, they look after them, and feed them with the milk they produce.

Need to know: The platypus is a very strange mammal - unlike most other mammals it lays eggs. It is also the only mammal that is poisonous - the male platypus has poisonous spurs on its legs.

Go back to the Tree of life to find out more about other living things.