Photograph of Lucy's Warbler - (c) Morgan Tingley

You are here

Birds of North America

Birds of North America (BNA) is a rich series of species accounts with extensive information about birds that occur regularly in Canada and the United States. A companion series on Neotropical Birds covers species from Mexico and the Caribbean through South America. Each account contains information on distinguishing characteristics, distribution, systematics, behavior, ecology, demography, conservation, and priorities for future research.

Search Birds of North America »

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.

Free BNA Access for AOS Members

​BNA Login for AOS Members »

Our members tell us how much they value their free access to Birds of North America. (Not a member? Join now!) Members, follow these steps:

  • Click the BNA Login link above
  • Once there, click the "American Ornithological Society" link
  • In the upper box, enter your 5- or 6-digit Member ID number (found on your member profile page when you log in to the OSNA Member Portal; same as "Customer ID")
  • In the lower box, enter your password (last name with only the first letter capitalized, e.g. Brewster)

Contact Scott Gillihan, Membership Manager (, if you need help or have questions.

Welcome to the American Ornithological Society (AOS)
Advancing Scientific Knowledge and Conservation of Birds

© 2019 American Ornithological Society