Critters of the Sea

Crustaceans encompass a vast array of hard-shelled, mostly aquatic animals such as crabs, lobster, shrimp, prawns, krill, and barnacles. Although woodlice and a few crab species live on land and in freshwater, most crustaceans live in the ocean. They can be found in every ocean habitat from prawns and shrimp swimming freely in the open ocean to barnacles attached to rocks, piers, and even the sides of ships. They will be encountered at every depth from krill, floating near the water’s surface to shrimp-like creatures in the ocean’s deepest trenches. There are 50,000 known species of crustaceans, with more discovered every year.


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