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

*United States
* Alaska
* Hawaii
* Canada
* Mexico

      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.