From page 166-167 in The Warbler Guide:
The Blackburnian Warbler has fiery orange throat, face, and under-eye arc. Its auricular patch has distinctive triangular shape, pointed at rear and bottom. The Blackburnian Warbler has broad white wing patch, and two pale braces on back unique among warblers. Especially in a dim forest, the bright flash of a Blackburnian can be startling as they sally for insects. Blackburnians nest and are often found high in trees, but color often makes them quickly identifiable. Adult females in spring are not as bright orange as males. The Blackburnian Warbler is a long-distant migrant, and it has relatively long wings.
Warblers are among the most challenging birds to identify. They exhibit an array of seasonal plumages and have distinctive yet oft-confused calls and songs. The Warbler Guide enables you to quickly identify any of the 56 species of warblers in the United States and Canada. This groundbreaking guide features more than 1,000 stunning color photos, extensive species accounts with multiple viewing angles, and an entirely new system of vocalization analysis that helps you distinguish songs and calls.
The Warbler Guide revolutionizes birdwatching, making warbler identification easier than ever before. For more information, please see the author videos on the Princeton University Press website.