Eastern Olivaceous Flatbill
Rhynchocyclus olivaceus
The eastern olivaceous flatbill is about 15 cm (5.9 in) long and weighs 18 to 24.8 g (0.63 to 0.87 oz). The sexes have the same plumage. Adults of the nominate subspecies have a dark olive head with a white eye-ring. Their entire upperparts are dark olive. Their wings are dusky with ochre to buff edges on the wing coverts and secondaries that form two dull wing bars. Their tertials have yellow edges. Their tail is a dusky with paler outer edges on the feathers. Their throat is pale gray to pale yellow, their breast grayish olive, and their belly, flanks, and vent are pale yellow. Voice: Researchers have identified two eastern olivaceous flatbill vocalizations. Its song is a "series of some 10 notes, starting with 1‒2 long notes and followed by much shorter notes". It may either ascend or descend and may be as short as just the initial notes with two shorter ones.
ID text from Wikipedia, CC BY-SA 4.0
Eye-ringed Flatbill
Rhynchocyclus brevirostris
The eye-ringed flatbill is 15 to 17 cm (5.9 to 6.7 in) long and weighs 21 to 23 g (0.74 to 0.81 oz). The sexes have almost the same plumage. Adults have a bold white eye-ring, a faint dark smudge below the eye, grayish lores and cheeks, and a dusky patch behind grayish ear coverts. The rest of their head and their entire upperparts are olive-green. Their wings and tail are dusky with paler yellow-olive edges on the feathers. Males have stiff comb-like barbs on the outer primaries; females lack them. Voice: The eye-ringed flatbill is "secretive and hard to locate" except by voice. Its vocalizations include "a thin, buzzy, insect-like zweeeeeeee-zweeeee (each part slightly rising) or zeeeee-zeeeee-zeeeee-zweeeeee!, just a single zeeeeee a high-pitched whistle, sweeeeet!".
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: Eastern Olivaceous Flatbill and Eye-ringed Flatbill.