Online interactive version (with linked citations, digital images, and full video and sound) of the Birds of North America, the definitive US scientific reference on the 700+ breeding birds of North America. First housed at the Academy of Natural Sciences of Philadelphia, BNA was initiated as an 18-volume print reference in the early 1990's under the guidance of the American Ornithologists Union and the Cornell Lab of Ornithology.
Searchable by species, topic, or keyword. Each species account covers the life details, behaviors, migration information, maps of breeding and wintering ranges, all habitat descriptions, and conservation and management guidelines. All information is regularly updated with the latest research findings from the leading researchers for each species.
Uses streaming RealPlayer for audio (bird songs and calls) and QuickTime for video.