This gnatcatcher species measures 10 to 13 cm (3.9 to 5.1 in) and weighs only 5 to 7 g, it is a very small song bird. 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.
Habitat and Distribution
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. These birds migrate to the southern United States, Mexico, northern Central America-(Belize, Guatemala, and Honduras), Cuba, Bahamas, Turks and Caicos Islands, and the Cayman Islands.
They forage actively in trees or shrubs, mainly eating insects, insect eggs and spiders.
They build a cup nest on a horizontal tree branch. Both parents construct the nest and feed the young; they may raise two broods in a season.