- 5.1–5.9 in
- 7.9–9.1 in
- 0.3–0.4 oz
- Moucherolle sombre (French)
- Mosquerito Oscuro (Spanish)
- The Dusky and Hammond's flycatchers are so similar that telling them apart is a true challenge. Color and pattern do not help. Even voice, usually the most helpful character in distinguishing Empidonax flycatchers, does not help much. The best character for this species pair in the hand is the length of the outer wing feathers: Dusky has relatively short wingtips, with the outermost feather (primary 10, or "p10") being shorter or the same length as the middle one (p5); Hammond's has long wingtips with p10 being longer than p5.
- The oldest recorded Dusky Flycatcher was a female, and at least 8 years, 2 months old when she was recaptured and rereleased during banding operations in California.
Scrub, brushy areas, thickets, aspen groves, open coniferous forests, and mountain chaparral.
Takes insects on the wing; perches on dead branches and twigs between forays.
Dusky Flycatcher is relatively common, and populations were stable, with a possible small decline, between 1966 and 2014, according to the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 7.8 million, with 60% spending some part of the year in the U.S., 96% in Mexico, and 39% breeding in Canada. The species rates an 11 out of 20 on the Continental Concern Score. Dusky Flycatcher is a U.S.-Canada Stewardship species and is not on the 2014 State of the Birds Watch List.