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Belugas, also known as white whales, are marine mammals that live together in small groups known as pods in the Arctic Ocean's coastal waters. From the genus Delphinapterus leucas, they are social animals and very vocal communicators using a high-pitched twitter and series of clicks, whistles and clangs. They range from 13 to 20 feet (4 to 6.1 meters) in length and have rounded foreheads and no dorsal fin. They are slow swimmers and mainly eat fish, crustaceans and other deep-sea invertebrates.