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This gnatcatcher species measures 10–13 cm (3.9–5.1 in) and weighs only 5–7 g (0.18–0.25 oz). Adult males are blue-grey on the upperparts with white underparts and have a long slender bill, long black tail and an angry black unibrow. Females are less blue without the unibrow. Both sexes have a white eye ring.
Their breeding habitat includes open deciduous woods and shrublands in southern Ontario, the eastern and southwestern United States, and Mexico. Among gnatcatcher species, this is in the only one to breed in Eastern North America.