These birds are remarkably similar in plumage: olive on the upper parts with light underparts, eye rings and wing bars. In the nesting season, they may be distinguished based on range, habitat and call; in other situations, it may not be possible to be sure.
The genus Empidonax is a group of small insect-eating passerine birds in the tyrant flycatcher family, the Tyrannidae.
In the nesting season, they may be distinguished on range, habitat and call; in other situations, particularly on migration, it may not be possible to be sure of specific identification.
Euler's Flycatcher, Lathrotriccus euleri and Gray-breasted Flycatcher, Lathrotriccus griseipectus were formerly placed in Empidonax, but differ anatomically and biochemically and are now split as the genus Lathrotriccus.
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