Photo gallery, trip reports, Arizona hummingbird banding program, and updates to "A Birder's Guide to Alaska".
Species accounts of North American birds, including images, descriptions, and sounds.
A step-by-step parametric search engine for identifying birds in North America. Site includes illustrations, calls, and links.
Comprehensive reference series on North American birds, with information and sample profiles.
Maps showing changes in distribution and abundance patterns of some North American birds during the period 1970-1989.