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This project is a coordinated series of six sites (three mountain and three lowland, four in Arizona and two in Sonora) selected to measure and monitor bird migration across a broad front of southeastern Arizona and northern Sonora through the use of constant effort mist netting. The six sites selected comprise a variety of elevations, habitats, and management regimes. They include lowland riparian and mountain sites selected for their migrant potential. A range of cooperators from both sides of the border will be involved and will gather data on habitat use, phenology, and site fidelity of Neotropical migrants during migration in southeastern Arizona and northern Sonora.