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
Piratic Flycatcher
Legatus leucophaius
The piratic flycatcher is 14.5 to 17 cm (5.7 to 6.7 in) long and weighs 19 to 26 g (0.67 to 0.92 oz). The sexes and the subspecies have the same plumage though subspecies L. l. variegatus is significantly larger than the nominate. Adults have a blackish forehead and crown with a partially hidden yellow patch on the latter. They have a wide dull whitish supercilium that extends around the head under the crown; it has some faint grayish streaks toward the rear. They have dusky lores, ear coverts, and moustachial stripe and white cheeks. Voice: The piratic flycatcher is highly vocal during the breeding season, and usually vocalizes from a high perch. Its call has been variously described as wee-o-dee!, "a whining querulous weé-yee", and "a loud, high, rising-falling whistle: wseeEEEeee".
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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