This mask represents one of the mythical human-eating birds that appear during the Hamatsa dances, the most important of the Tseyka dances. The appearance of these masks helps to calm and tame the initiate Hamatsa dancer, who has been possessed by the Cannibal Spirit. The dancer, hidden by a long fringe of red-dyed cedar bark, imitates the high-stepping actions of the bird, shouts the bird's call, and snaps the hinged beak loudly at important points of the dance. (Holm, Crooked Beak of Heaven, 1972)