Yellow-rumped warbler

The Yellow-rumped Warbler breeds from eastern North America west to the Pacific, and southward from there into Western Mexico.
In summers, males of both forms have streaked backs of black on slate blue, white wing patches, a streaked breast, and conspicuous yellow patches on the crown, flank, and rump. Females are more dull, with brown streaking front and back, but still have noticeable yellow rumps.