One of the largest and rarest warblers. Breeds only in young jack pine forests in northern Michigan and Wisconsin. Winters in the Bahamas; seldom seen in migration. Blue-gray above and lemon-yellow below with broken white eye-ring, thin white wingbars, and black spotting on sides. Female slightly browner than male. Constantly pumps tail up and down. Most similar to drab female or immature Magnolia Warbler but larger with gray (not greenish) back and tail-pumping behavior. Also compare with Canada Warbler, which has bold black streaks across breast and bold yellow spectacles.