Pacific-slope Flycatcher

Overview

The Pacific-slope Flycatcher is a small flycatcher of shaded forest habitats along the Pacific coast and interior mountain ranges of western North America, closely resembling several other Empidonax species and until relatively recently classified together with a similar interior species as a single taxon. As with other members of the genus, subtle plumage details combined with range and voice are needed for confident identification.

Plumage shows olive-brown upperparts and yellowish underparts, generally appearing warmer-toned than many eastern Empidonax species, along with a distinctive pale eye-ring that often has a slightly pointed or teardrop shape at the rear rather than being perfectly round.

Feather ID Notes

Pacific-slope Flycatcher feathers show olive-brown upperparts and a yellowish wash across the throat, breast, and belly, generally warmer than many Empidonax species found farther east. The eye-ring is pale and often shows a subtle teardrop or almond shape, wider toward the rear of the eye, and the wing bars are buffy rather than stark white.

• Head/back feathers: olive-brown, moderately warm-toned
• Underpart feathers: yellowish, especially on the belly
• Eye-ring: pale, often teardrop or almond-shaped rather than perfectly round
• Wing feathers: dark with buffy wing bars The warmer yellowish tones and teardrop-shaped eye-ring provide some help distinguishing this species from grayer Empidonax relatives, though it remains extremely similar to Cordilleran Flycatcher, with voice and range typically needed for certainty.

Plumage Details

Sexes look alike in this species, sharing the same olive-brown and yellowish pattern. Juveniles show buffier wing bars and slightly warmer overall tones that shift toward the adult pattern after their first molt. There is no strong seasonal plumage variation, though fresh feathers after molt can appear more richly colored than worn ones.

Habitat & Range

This species breeds in shaded forest habitats along the Pacific coast and adjacent mountain ranges of western North America, including coastal forest, canyons, and riparian corridors with substantial canopy cover. It is a migratory species, wintering primarily in Mexico, with populations generally vacating the breeding range in the colder months.

Behavior & Field Notes

Pacific-slope Flycatchers forage by sallying from a perch within shaded forest to catch flying insects, typically remaining within or near the canopy rather than open habitat. Diet is primarily flying insects. Nests are small cups often placed in a natural cavity, crevice, or on a ledge, sometimes on human structures near forest habitat. The call is a soft, upslurred "tsweet," differing from the calls of the closely related Cordilleran Flycatcher, which is important for distinguishing the two where their ranges approach one another.