The actual geographic boundaries between the Nearctic and Neotropical Regions are difficult to define because climate and vegetation changes occur gradually. John Rappole and his co-authors in their publication Nearctic Avian Migrants in the Neotropics defined the neotropics as the region of the Western Hemisphere located between the Tropic of Cancer and the Tropic of Capricorn. Rappole et al. Copyright 1996-2001 Georgia Wildlife Federation. All Rights Reserved.
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