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
Succinct text describes key identification features for each species
A QR code takes you to a range of common vocalizations for each species