The unicorn whale is a deep-water animal in the family Characidae of the order Cetiformes. It has a small and round head, an indistinct beak, a protruding forehead, and a slight upward tilt in front of its mouth. Most male unicorn whales will grow a long tooth from the left side of their upper jaw after the age of one, which is called a unicorn whale because it resembles the horn of a wild animal; Most female whales do not have teeth. Unicorn whales mainly live in the northern end of the Atlantic Ocean and the Arctic Ocean, and have also been found in small quantities in the Greenland Sea, mostly living north of the Arctic Circle. Unicorn whales are social animals, and there are strict boundaries between populations. The food of unicorn whales includes flatfish and Arctic cod. The biggest natural enemy of unicorn whales is humans.