eNature Field Guide to Birds is a guide to America's birds with species pictures, field descriptions, range maps, bird calls, habitat information, and more.
Patuxent Bird Identification InfoCenter
Presents photographs, songs, videos, identification tips, maps, and life history information for North American birds.
With photos and information on a number of bird species, from common to exotic.
Bird Identification Tips
List of prominent features for each type of bird as well as features of the adult alternate and similar species.
Offers a glossary and a diagram featuring the identification term given to every inch of the bird's body.
Wild Bird Guide - Animal Planet
Explore wild birds in Animal Planet's guide, which includes hummingbirds, mockingbirds, yellow warblers, and other favorites. Learn about the many birds you might find in your own backyard.
Peterson Bird Identifications
Presents Roger Tory Peterson's artwork of North American bird species, with full life histories, seasonal range maps, and depictions of similar species.