Even after the contributions of Wilbur (1987) and several recent reports in Western Birds, the distribution of many birds in Baja California remain poorly known. Observations report in this paper were made by the authors separately or together between 1975 and June 1994. But this paper only include data for northwestern Baja California, that is, between the international border and Río de El Rosario and west of the summits of the Sierras Juárez and San Pedro Mártir. Almost all the records are based on sight identifications only, owing to the difficulty, even for Mexican citizen, in complying with current collecting regulations in México. A total of 44 birds were sighted in 42 sites visited.

This paper report a survey of the breeding birds of Laguna Figueroa and La Pinta pond, Baja California. A total of 7 species were counted six of them were reported in both sites.

In the peninsula of Baja california the only breeding colonies of Caspian Tern known so far are Scammon´s Lagoon and Laguna San Ignacio both of these colonies are located south of latitude 28° in the state of Baja California Sur. This note report an additional small breeding colony at Laguna Figueroa (30° 40´N), the first for the state of Baja California. This lagoon was visited on 7-9 May, 28 May and 22 June 1991. Results were first visit, same breeding birds reported previously, second visit one pair of Caspian Tern one individual alone, and a nest with one egg, third visit 22 individuals (10 pairs), six nest with one egg, three with two eggs, two eggs broken by predators and a few empty nest scrapes.

Point Reyes Bird Observatory organized a broad survey to quantify the importance of specific wetlands to wintering and migratory shorebirds in western North America. In wetlands along the west coast of Baja California, México, 354,905 shorebirds were estimated present in winter based on ground and air surveys between January 1991 and January 1994. The Laguna Ojo de Liebre/Guerrero Negro wetland complex held many more wintering shorebirds than any other Baja California site.