
Photographs from iNaturalist · photographer credits
Adults have olive-gray upperparts, darker on the wings and tail, with whitish underparts; they have a noticeable medium-width white eye ring, white wing bars and a medium length tail. The breast is washed with olive-gray. The bill is mainly dark. It is a bit smaller than the American grey flycatcher and a bit larger than the Hammond's flycatcher.
These birds migrate to southern Arizona and Mexico. As non-breeding residents in the south of their migration range, they are passage migrants over the deserts of the south-western United States, the Mojave, Sonoran, and Chihuahuan Deserts, where they make their stops along the flyway.
They often wait on an open perch and fly out to catch insects in flight (hawking), and will also pluck insects from foliage while hovering (gleaning).
Adapted from American dusky flycatcher on Wikipedia, used under CC BY-SA 4.0.