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The American Oystercatcher subspecies H. p. frazari, is a resident on both coasts of the Baja California peninsula and along the western coast of Mexico, and is a high conservation priority due to its small population size, restricted distribution, and high susceptibility to human activities. Recent estimates suggest that Sinaloa is an important breeding and wintering area, but the population dynamics here are understudied. Conselva, Costas y Comunidades was awarded $14,630 to determine the population size and habitat use during the full annual-cycle of American Oystercatchers in three coastal lagoons in Sinaloa, with the goal of identifying critical zones to support conservation and management actions for the species.