The Pigeon Guillemot (Cepphus columba) nests at numerous small colonies and scattered individual sites from the Channel Islands, California, north to Alaska (Ewins et al. 1993). During the nonbreeding season, birds are virtually absent from California, Oregon, and the outer coast of Washington (e.g., Briggs et al. 1987), and the winter distribution of Pigeon Guillemots breeding along the west coast of North America is at best incompletely known.