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Fish is the common name for 29,000 species
of cold-blooded, backboned animals that live in freshwater and ocean environments.
Fish breathe using gills. Most have a body covering of scales and move using
fins. Many fish hunt other fish for food. Fish are also an important food for
other animals such as humans, birds, seals, and whales. Overfishing by
humans has now made some fish endangered.