The pantropical Masked Booby (Sula dactylatra) is one of the most pelagic Pelecaniformes off the Pacific coast of Mexico. The Masked Booby breeds on Isla Clarión and Isla San Benedicto in the Revillagigedo group (Everett and Anderson 1991) and on Clipperton Atoll (A.O.U. 1983). It has been reported breeding at Las Rocas Alijos (24°57' N, 115°45' W) since 1925 (Hanna 1926, McLellan 1926), with a current breeding population of about 50 pairs (Pitman 1985).
Only three sighting reports exist for the Pacific coast of Baja California: one juvenile on 23 April 1988 at Islas Los Coronados, Baja California (Everett and Teresa 1988), and single adults on 18 December 1968 and 30 November 1980, both at Cabo San Lucas, Baja California Sur (Wilbur 1987).