Resources
Migrant Birds in the Neotropics Keast and Morton 1980 in part
The nearctic-neotropical migration system is one of the world’s greatest and most complex, birds from the whole length and width of the North American continent being compressed into Middle America and northern South America, a land area a fraction of the breeding area’s size. The neotropics are, nevertheless, extremely rich as bird habitat, supporting the world’s richest endemic avifauna. These features pose fascinating questions.