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
White-headed Marsh Tyrant
Arundinicola leucocephala
Voice: They are usually quiet, but they do emit a high-pitched call "sedik!". During courtship, they produce a deeper call "dew-de-lewde", which is repeated at short intervals.
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: Eye-ringed Flatbill and White-headed Marsh Tyrant.