Birds of North America (BNA) - New Online Resource
Birds of North America (BNA) is a comprehensive reference covering the life histories of North America's breeding birds, contents are updated frequently, with contributions from researchers, citizen scientists, and designated reviewers and editors. The references tab contains an extensive bibliography. In addition, BNA Online contains image and video galleries showing plumages, behaviors, habitat, nests and eggs, and more. Most online BNA accounts now feature recordings of the songs and calls of their species. It is great fun for everyone.