American Dusky Flycatcher
Empidonax oberholseri
Adults have olive-gray upperparts, darker on the wings and tail, with whitish underparts; they have a noticeable medium-width white eye ring, white wing bars and a medium length tail. The breast is washed with olive-gray. The bill is mainly dark. It is a bit smaller than the American grey flycatcher and a bit larger than the Hammond's flycatcher. Voice: The male sings a three-part song. A common call is a dry whit, similar to that of other Empidonax flycatchers. A less common call, that is possibly only given by the male, is a sad dew-hic.
ID text from Wikipedia, CC BY-SA 4.0
Hammond's Flycatcher
Empidonax hammondii
Adults are 12–14 cm long (4.7–5.5 in), span about 22 cm (8.7 in) across the wing and weigh 8–12 g (0.3–04 oz). They have grayish-olive upperparts, darker on the wings and tail, with whitish underparts; they have a conspicuous white eye ring, white wing bars, a small bill and a short tail. The breast is washed with grey and the sides of the belly with yellow. Females usually have a shorter, wider bill than males. Immature birds are similar to adults, but have broader wing bars and are more buff. Many species of Empidonax flycatchers are very similar in appearance. Voice: The song is a multi-versed, hoarse ssilit, greeep, silit, pweet. The call is a sharp peek. Hammond's flycatchers do not sing during the fall migration or on wintering grounds. They start singing in early May, shortly after their arrival on breeding grounds.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: American Dusky Flycatcher and Hammond's Flycatcher.