What is the sea urchin's habitat?

They are usually found on the pacific coast. For example they are found on the Monterrey Bay. They can also be found in areas of water up to 400 feet deep.

The Sea! -- Actually, urchins make up a large number of individual species which are common around the world in all tropical marine environments, and some species can even be found in colder climates. Since they graze for algae on surfaces, they inhabit the sea bottom and reefs and are also extremely common on mangrove roots in mangrove forests.

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