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Crabs are 10-legged animals that walk sideways. There are almost 5,000 different species of crabs; about 4,500 are true crabs, plus about 500 are hermit crabs (hermit crabs don't have a very hard shell and use other animals' old shells for protection). Most crabs live in the oceans, but many, like the robber crab, live on land.

The Biggest Crabs: The biggest crab is the Japanese Spider crab (Macrocheira kaempferi), which lives on the floor of the north Pacific Ocean; it has a 12 ft (3.7 m) leg span. The biggest land crab is the Coconut crab (Birgus latro), which lives on islands in the Pacific Ocean; it has a leg span up to 2.5 ft (75 cm).

Diet: Many crabs are omnivores (plant- and meat-eaters), others are carnivores (meat-eaters), and some are herbivores (plant-eaters).

Anatomy: Crabs are invertebrates, animals without a backbone. They have an exoskeleton (also called a carapace), an outer shell that both protects them from predators and provides support. These crustaceans have ten jointed legs, two of which have large, grasping claws (called pincers or chelipeds). They have a flattened body, two feelers (antennae), and two eyes located at the ends of stalks.

Breathing: Marine crabs breathe underwater using gills, which are located in a two cavities under the carapace. True land crabs have enlarged, modified cavities that act like lungs so that the land crabs can breathe air.

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