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
Buff-breasted Flycatcher
Empidonax fulvifrons
The buff-breasted flycatcher is about 13 cm (5.1 in) long and weighs 6.9 to 9.3 g (0.24 to 0.33 oz). It is the smallest member of genus Empidonax in the US and among the smallest overall. The sexes are alike. Subspecies E. f. pygmaeus is the best known. Adults have dull buffy white lores and a faint dull buffy white eye-ring on an otherwise buffy greenish brown face. Their crown, nape, and upperparts are a darker buffy greenish brown than the face. Their tail is grayish brown with paler grayish white outer webs on the feathers. Voice: The buff-breasted flycatcher's song in Guatemala and Honduras is "a rapid ti'beuu! or pi'dew!" and its call there "a soft, liquid wit". Further north its song is described as chee-lick or chee-lick chou" and its call as "a single pit note".
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 Buff-breasted Flycatcher.