Cornell Ornithology's "All About Birds" is handy for overviews, and the Sibley guide, published by Knopf, has been my go-to identification resource (in either t

Cornell Ornithology's "All About Birds" is handy for overviews, and the Sibley guide, published by Knopf, has been my go-to identification resource (in either the paper form or the iOS app) for many years now.