Warblers in Your Pocket: A Guide to Wood-Warblers of the Upper Midwest

Robins may be the official harbingers of spring, but the arrival of the wood-warbler signifies the real beginning of the season. These brightly colored songsters, most of whom have migrated extremely long distances to reach their summer nesting grounds, appear like animated jewels from treetops to shrubs to ground throughout the Midwest. Adult males in fresh spring plumage are particularly striking: the buttery yellow of the commonly seen yellow warbler; brilliant orange of the Blackburnian...