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Beluga whale (^IDelphinapterus leucas^i). This whale, also known as the white whale, is found along the Arctic coasts of Europe and North America. It migrates to shallow fresh-water rivers in the summer to calve and feed. It is a highly social animal that forms groups, or pods, of up to 25 individuals. During migration these pods can merge to number 1000s of individuals. The beluga whale is highly vocal, creating sounds that include squeaks, chirps, whistles and clicks through its blowhole. It feeds on crustaceans, fish and worms that it finds on the sea bed. It grows to 5.5 metres in length. Photographed off the coast of Vancouver. (KEYSTONE/SCIENCE PHOTO LIBRARY/CHRISTOPHER SWANN/SCIENCE PHOTO LIBRARY)