Long-tailed Tyrant
Colonia colonus
Male long-tailed tyrants are 23 to 28 cm (9.1 to 11 in) and females 18 to 22 cm (7.1 to 8.7 in) long; these measurements do not include the elongated central tail feathers. Adults weigh 15 to 18 g (0.53 to 0.63 oz). Adult males of the nominate subspecies C. c. colonus are mostly dull black with a white forehead and forecrown, a whitish rump, and a grayish black belly. Their central pair of tail feathers can extend up to 13 cm (5.1 in) beyond the others and have somewhat widened tips. They are often worn or broken. Voice: The long-tailed tyrant's a soft, rising, call variously written as "sweeE", "wheet", "sweee?", "weee?", and "weé-uw". Males sing "a longer twee-la, twee-la, twee-la", a "musical, humming druu" while whipping the tail, and a "sharp, sibilant chip in interactions".
ID text from Wikipedia, CC BY-SA 4.0
White-crested Tyrannulet
Serpophaga subcristata
The white-crested tyrannulet is 11 cm (4.3 in) long and weighs 6 to 8.6 g (0.21 to 0.30 oz). The sexes have the same plumage. Adults of the nominate subspecies have a gray crown and nape with white central crown feathers that are usually hidden but sometimes raised as a crest. They have a thin white supercilium, a white partial eye-ring, and a dusky line through the eye on an otherwise grayish white face. Their upperparts are grayish olive. Their wings are dusky to blackish with pale buffy edges to most of the flight feathers and two whitish to pale buffy wing bars. Voice: The white-crested tyrannulet's song differs somewhat among the subspecies. That of the nominate is described as an "almost mechanical-sounding trill with few introductory rising notes, psee psee psee-e-e-e-e-e-e". It also makes a "slower, bubbly tweetweetweetweetweetwee, and occasionally other, more jumbled chatters". The song of S. s.
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: Long-tailed Tyrant and White-crested Tyrannulet.