Scientific name: Polioptila caerulea
The widely distributed Blue-gray Gnatcatcher is the only migratory gnatcatcher, and it is quite an early spring migrant and an early nester in the U.S. Blue-gray Gnatcatchers occur year-round in southernmost reaches of the U.S., and are occasionally found farther north in winter.
Gnatcatchers are vocal and active prior to and during nest construction. Males stay close to females during this time. Adults are known to mob predators, and their vocalizations often draw other species to the mob.