The Birds of North America Online
BNA Online provides comprehensive life histories for each of the 716+ species of birds breeding in the USA (including Hawaii) and Canada.
Account contents are updated frequently, with contributions from researchers, citizen scientists, and designated reviewers and editors. In addition, BNA Online contains image and video galleries showing plumages, behaviors, habitat, nests and eggs, and more. And most online BNA accounts now feature recordings of the songs and calls of their species, recordings selected from the extensive collection of Cornell's Macaulay Library of Natural Sounds.