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Birds of North America; a Guide to Field Identification (Golden Field Guide)
Birds of North America a Guide to Field Identification - Golden Field Guide Author:Chandler S. Robbins, Bertel Bruun, Herbert Zim, Arthur Singer About 1780 species of birds representing 97 families live and breed on the continent of North America. When Central America and Mexico are dropped out, the number of breeding birds (permanent residents and migrants) falls to about 645 species. Another 50 or so migratory species are regular or casual visitors. All of these represent 75 families. ... more »Perhaps 100 more species occur accidentally. This last group is not an integral part of the North American bird population.
This guide covers a continental land mass of over 9 million square miles. Geographically and climatically, North America ranges through a rich variety of subtropical, temperature, and arctic environments.
The 645 or so breeding species in North America north of Mexico total less than 8 percent of the world's 8600 or so birds, but North America makes up almost 17 percent of the world's land. This relative discrepancy may only reflect the fact that North America, north of Mexico, has no true tropical component in its climate.« less