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Willow Flycatcher (Empidonax traillii traillii)
Chester County, Pennsylvania, United States The Alder and Willow Flycatcher are visually impossible to tell apart.
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Acadian Flycatcher (Empidonax virescens)
ProAves Cerulean Warbler Reserve, San Vicente de Chucuri, Santander, Colombia
Migratory. A bit greener than other similar flycatchers.