Rhinoceros auklet Cerorhinca monocerata

Identification Tips:

Adult alternate

Adult basic

Similar species:

Bill shape should render it easily identifiable in all plumages. In basic plumage, the mostly dark plumage is shared by the smaller Cassin's Auklet, whiter-bellied Parakeet Auklet, and larger-billed Tufted Puffin. In alternate plumage, the head plumes and horn are diagnostic.

Length and wingspan from: Robbins, C.S., Bruun, B., Zim, H.S., (1966). Birds of North America. New York: Western Publishing Company, Inc.