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any of three little-known tropical or subtropical seals of the genus Monachus, family Phocidae. Characterized by V-shaped hind flippers, monk seals are brown or black as pups, and dark gray or brown above, paler or whitish below as adults. They feed on fish, cephalopods, and crustaceans. Adults are 2-3 m (6.6-10 feet) long and weigh 225-275 kg (500-610 pounds)