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Northern hemisphere male Fin Whales measure up to 78ft (24m) and in the southern hemisphere up to 88ft (26.8m). Females are slightly larger than males and both sexes weigh between 50 and 70 tons (45,360-63,500 kg). Fins feed mainly on small shrimp-like creatures called krill and other schooling fish, and consume up to 2 tons (1,814 kg) of food a day. As a baleen whale, it has fringed over-lapping plates instead of teeth. As it feeds, large volumes of water and food are drawn into the mouth. As the mouth closes the water is expelled through the baleen plates and trapped food can then be swallowed. Fin Whales are believed to mate during the winter and the female is pregnant for 11 months. At birth, the calf is 18 to 20ft long and they nurse for 6 to 7 months, separating from the mother after about a year.