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All About Birds: Warbling Vireo <br />Page 2 of 2 <br />Other tVames <br />Vireo melodieux (French) <br />Vireo. gorjeador (Spanish) <br />Cool Facts <br />® The Warbling Vireo may be made up of two or three species. The eastern and western forms differ <br />slightly in size, bill shape, genetics, molt strategies, wintering areas, and possibly voice. Western birds <br />are slightly smaller, have smaller, darker bills, are more olive-green on the upperparts, and have a <br />darker crown than the eastern birds. <br />Sources used to construct this page: <br />Gardali, T., and G. Ballard. 2000. Warbling Vireo (Vireo gilvus). In The Birds of North Air -erl.4e, No. 551 (A. tol <br />Poole and F. Gill, eds.). The Birds of North America, Inc., Philadelphia, PA. <br />Full detailed_~pecies account> <br />http://www.birds.eornell:edu/AllAboutBirds/BirdGuide/Warbling_Vireo.html 1/7/2009 <br />