Crabs are short-tailed decapods, found in all oceans, in freshwater, and on land. Its carapace (upper body shield) is usually broad, and its first pair of legs is modified into pincers. Most crabs live in the sea and breathe through gills, which in land crabs are modified to serve as lungs. They walk or crawl, generally with a sideways gait; some are good swimmers. Crabs are omnivorous scavengers, but many are predatory and some are herbivorous. One of the largest known crustaceans is the giant crab of Japan (13 ft, from claw tip to claw tip), a spider crab. Other species are less than an inch long.
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