Avifaunal
diversity varies dramatically
throughout the world, with over 9000 species of birds in virtually every
terrestrial and aquatic habitat on earth. Photo courtesy Ann
Cook
There is evidence that nearly 150,000 species of birds once lived on the earth, so what we see today is only a fraction of the world's avifauna over geological time. Avifaunal diversity varies dramatically throughout the world. If you are new to a region, a regional checklist of birds will make birding easier . On this page below you will find links to North America locations;links will take you to separate pages for US checklists and checklists from around the world.
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