Birds of North America (BNA) is a rich database of species accounts with extensive information about birds that occur regularly in Canada and the United States and is accessible to AOS members free of charge. Each account contains information on distinguishing characteristics, distribution, systematics, behavior, ecology, demography, conservation, and priorities for future research.

The BNA series was produced as a collaborative effort of the former American Ornithologists’ Union, the Cornell Lab of Ornithology, and the Academy of Natural Sciences. It was first published in print over a period of 10 years, with 18 volumes completed in 2002. It is now published online through the Cornell Lab of Ornithology.


Birds of North America Access Information

BNA website

For AOS Members
Login to Birds of North America

Member log-in instructions:

  • Follow the link above, then click on “American Ornithological Society.
  • In the upper box, enter your 5- or 6-digit Member ID number. This number can be found on the upper left when you log in to the Member Portal (same as “Customer ID”)
  • In the lower box, enter your last name with only the first letter capitalized (e.g. Brewster).