The Rhinoceros Auklet is a medium-sized Alcid which breeds and winters along the west coast of North America. Within the Neotropics, it is restricted to pelagic waters off northwest Mexico during the nonbreeding season. The Rhinoceros Auklet can be seen alone or in groups, foraging by diving from the surface of the water for small fish. The Rhinoceros Auklet can be confused with other similarly-sized alcids, however, its flat head and distinctive angular bill set it apart when seen well. When sitting, the Rhinoceros Auklet is all dark above the water line, and when in flight, a pale belly patch can be seen. Breeding adults aquire a horn on the bill and two white facial plumes.