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 viewsDrawings of undertail patterns provide at-a-glance comparisons between speciesIcons 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 treesSuccinct text describes key identification features for each speciesA QR code takes you to a range of common vocalizations for each species