Ojo de Liebre (Scammon's) Lagoon, on the west coast of the Baja California peninsula, is surrounded by salt marshes and salt flats exposed to periodic tidal inundation. Part of these areas was modified in 1956 by the building of saltworks, a system of managed ponds covering 27,773 ha. These ponds contain several islands, sandbars, and sand flats suitable for nesting birds (Figure 1). In 1996 we surveyed the saltworks’ nesting birds, as part of a year-round study (Carmona and Danemann 1998).