Large-headed Flatbill
Ramphotrigon megacephalum
The large-headed flatbill is 12.5 to 13.2 cm (4.9 to 5.2 in) long and weighs 13 to 15 g (0.46 to 0.53 oz). The sexes have the same plumage. Adults of the nominate subspecies R. m. megacephalum have a dark olive crown, dusky lores, a whitish to yellowish streak behind the lores, and a whitish to yellowish eye-ring on an otherwise dark olive face. Their upperparts are dark olive. Their wings are mostly dusky with yellow-olive edges on the flight feathers and ochraceous tips on the coverts; the latter show as two wing bars. Their tail is dusky with yellow-olive edges on the feathers. Voice: The large-headed flatbill's dawn song is "a continuous, rapidly uttered series of tee-tu-twit or whu hu-hoowhip whistles" and its call "a soft mournful wheé-whoo (or "bam-boo") whistle.
ID text from Wikipedia, CC BY-SA 4.0
Rufous-tailed Flatbill
Ramphotrigon ruficauda
The rufous-tailed flatbill is 15 to 16 cm (5.9 to 6.3 in) long and weighs about 17 to 26 g (0.60 to 0.92 oz). The sexes have the same plumage. Adults have an olive-green crown, a faint pale line behind the lores, and a faint pale eye-ring on an otherwise dark olive-green face. Their upperparts are mostly dark olive-green with bright rufous uppertail coverts. Their wings are mostly blackish with wide bright rufous edges on the flight feathers and tips on the coverts; the latter show as two wing bars. Their tail is bright rufous. Voice: The rufous-tailed flatbill's dawn song is "a low mewing whistle ending with a higher hiccup: meeoooOOoo'WEEpur!". Its day vocalization, which might be either a call or song, is "a low, rising-falling or slightly quavering, mewing whistle: meeooo, or with terminal emphasis: meeooo'OO", also described as a "high, slow, mournful weaeaea-wur".
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: Large-headed Flatbill and Rufous-tailed Flatbill.