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Length: 12.75cm (5in). Head is triangular in shape with a white eye ring, lower mandible is orange, upperparts are brown-olive, olive breast, yellow throat, belly and undertail coverts, 2 white-yellow wing bars. It is very difficult to distinguish from the Cordilleran Flycatcher (Empidonax occidentalis) in the field, except by the call of the male. In winter, both species migrate south to Mexico, where they are virtually indistinguishable from one another.
 Similar Species
The Pacific-slope Flycatcher was formerly considered conspecific with the Cordilleran Flycatcher under the name Western Flycatcher.
Three subspecies are recognized:
The form E. d. insulicola which is breeding on the Channel Islands off California are isolated and may deserve status as a full species.
Preferred habitats include moist, shaded coniferous or mixed forests.
Prey is caught in the air, or from foliage. The diet is mainly flying or crawling insects.
Nests can be made in tree stumps and upturned tree roots. The female builds the nest of moss, grass, rootlets, bark, and lichen, and lines it with hair and feathers. 3-4 eggs are laid and incubated for 14 to 15 days. Both parents feed the young, which leave the nest at about 15 days. The young stay near the nest for a few days after fledging.
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