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Our knowledge of avian behaviors during the non-breeding period still lags behind that of the breeding season, but the last decade has witnessed a proliferation in research that has yielded significant progress in understanding migration patterns of North American birds. And, although the great majority of migration research has historically been conducted in the eastern half of the continent, there has been much recent progress on aspects of avian migration in the West. In particular, expanded use of techniques such as radar, plasma metabolites, mist-netting, count surveys, stable isotopes, genetic data, and animal tracking, coupled with an increase in multi-investigator collaborations, have all contributed to this growth of knowledge. There is increasing recognition that migration is likely the most limiting time of year for migratory birds, and this places increasing importance on continuing to decipher patterns of stopover ecology, identifying critical stopover habitats, and documenting migration routes in the diverse and changing landscapes of the American West. Here, we review and briefly synthesize the latest avian migration findings and advances and consider research needs to guide future research on migration in the West.

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Published as Carlisle, Jay D., Susan K. Skagen, Barbara E. Kus, Charles Van Riper III, Kristina L. Paxton, and Jeff F. Kelly. 2009. "Landbird Migration in the American West: Recent Progress and Future Research Directions." The Condor 111, no. 2: 211-225. © 2010 by the Cooper Ornithological Society. Copying and permissions notice: Authorization to copy this content beyond fair use (as specified in Sections 107 and 108 of the U. S. Copyright Law) for internal or personal use, or the internal or personal use of specific clients, is granted by Cooper Ornithological Society for libraries and other users, provided that they are registered with and pay the specified fee via Rightslink® on Caliber ( or directly with the Copyright Clearance Center,