This is a handy, pocket-sized foldout reference to the 45 most commonly seen North American warblers. Photos include side-on, underside, and 45-degree views. Drawings of undertail patterns provide at-a-glance comparisons between species. Icons depict generalized color patterns for each bird and where the species is usually found on the ground, low in trees or vegetation, midstory, or toward the top of trees.