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A narwhal stands out in a crowd because of its frontwards-projecting, braided tusk. This tusk-toting mammal is a large-sized, mottled color resident of Arctic waters. Narwhal populations may be found off arctic Canada and Russia, western Greenland, Iceland, and the polar islands off Scotland. They migrate between summer and winter feeding stations. The winter feeding stations tend to require deeper dives than the shallower feeding possibilities of summer. In addition to its specific geographic range, the narwhal also has a particular diet. There are certain fishes that it prefers: Arctic and polar cod, Gonatus squid, Greenland halibut, and shrimp. But it also is willing to accept as prey wolffish and capelin. With such special demands, the narwhal especially is vulnerableto climate and environmental changes. In fact, such changes may be even more threatening than traditional predation by hunters, killer whales [Orcinus orca], and polar bears [Ursus maritimus].

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