In Mexico, Brandt's Cormorant (Phalacrocorax penicillatus) breeds mostly on islands and offshore rocks along the Pacific coast of the Baja California peninsula (Everett and Anderson 1991; Grinnell 1928; Wilbur 1987). The southernmost known colony on the Pacific coast is at the north end of Isla Margarita (approximately 24°30' N, 112°W; Guzman in Everett and Anderson 1991). Colonies in the Pacific can contain thousands of individuals.