Black-capped Flycatcher
Empidonax atriceps
The black-capped flycatcher is 10 to 12 cm (3.9 to 4.7 in) long and weighs about 9 g (0.32 oz). The sexes are alike. Adults have a black crown with a short crest and a bold white eye-ring that is wider behind the eye on an otherwise brownish olive face. These features by themselves set it apart from all other Empidonax. Their nape and upperparts are also brownish olive. Their tail is dusky with white outer webs on the outer feathers. Their wings are dusky with pale brown edges on the secondaries and tertials. The wing coverts are dusky with pale brown tips that show as two wing bars. Voice: The black-capped flycatcher has a variety of vocalizations. It makes a "loud keep-keer" in the breeding season, a keep-keep-keep-keep during interactions with others of its species, and "simple whistled tsip, chip, or whit" calls.
ID text from Wikipedia, CC BY-SA 4.0
Yellowish Flycatcher
Empidonax flavescens
The yellowish flycatcher is 12.5 to 14 cm (4.9 to 5.5 in) long and weighs 9 to 16 g (0.32 to 0.56 oz). The sexes are alike. Adults of the nominate subspecies have a pale yellow almond-shaped eye-ring on an otherwise yellowish green face. Their crown, nape, and upperparts are olive-green. Their tail is dusky to blackish with yellowish green edges on the feathers. Their remiges are mostly dusky to blackish and glossy. Their primaries have pale olive edges and the secondaries and tertials have pale yellow edges to the outer webs. Voice: The yellowish flycatcher's dawn song is "a series of three high-frequency notes sounds like seee chit seee or seee seee chit seee seee seee". Its calls include a very high "upslurred whistle, seee", a "loud, underslurred, and short note, tseeep", and "a louder tsick or tseet".
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: Black-capped Flycatcher and Yellowish Flycatcher.