From Houghton Mifflin Company, Peterson Bird Identifications is a nicely done online field guide featuring the artwork of the eminent naturalist, Roger Tory Peterson. The accompanying text was written by both Peterson and Kenn Kaufman -- another legendary birder. The website contains profiles for numerous birds including the Barn Owl, Elegant Trogon, Magnificent Frigatebird, and Ruby-throated Hummingbird -- just to name a few. Bird profiles include brief sections on Field Marks, Range, Habitat, Feeding, Nesting, and more. The site also links to a list of seasonal birding spectacles, birding resources, a tutorial based on Peterson's Identification System, and information about Peterson Field Guides.