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Fact file

Cnidarians Proper name: Phylum Cnidaria (ni-dairy-ah)
Examples: Corals, sea anemones, jelly fish

Numbers of species: About 9,000
Where they are found: In the oceans and in freshwater

Description: There are many different types of cnidarian, but most have a ring of tentacles surrounding their mouth - the tentacles are used to pass food to the mouth of the animal.

Need to know: Cnidarians have stinging cells (called nematocysts) that help them to catch their prey.

Find out more about cnidarians
Find out more about fossil corals

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