MacGillivray’s warblers breed in western North America as far north as southeastern Alaska and as far south as Central Arizona and parts of southern California. There have been records of them nesting as far east as the Cypress Hills of South Dakota, but they are more commonly found in the Rocky Mountains and west to the Pacific Ocean. MacGillivray’s warblers winter primarily along the pacific slope of Central America from north Mexico to Panama, though they occur as far south as Colombia. Some birds have been known to over winter as far north as southern California (San Diego), but this is quite rare.
Biogeographic Regions: nearctic (Native ); neotropical (Native )Rights Holder
: The Regents of the University of Michigan and its licensorsBibliographic Citation
: Karp, D. 2007. "Oporornis tolmiei" (On-line), Animal Diversity Web. Accessed April 27, 2013 at Citation Link