Dusky Chlorospingus
Chlorospingus semifuscus
The dusky chlorospingus is 14 to 15 cm (5.5 to 5.9 in) long and weighs 17 to 23 g (0.60 to 0.81 oz). The sexes have the same plumage. Adults of the nominate subspecies have a dark gray crown and face with sometimes a tiny white spot behind the eye. Their nape, upperparts, and tail are dark olive. Their flight feathers are dusky with yellowish olive edges except on the tertials, which are mostly dark olive. Their throat and underparts are mostly brownish gray. Their breast, flanks, and undertail coverts have an olive tinge. Voice: The dusky chlorospingus' song is "a series of almost hummingbird-like, high-pitched notes that gradually speed up and gain strength, becoming quite 'spanking' before ending in a dry sputter". It is most often heard at dawn and sometimes in late afternoon. The species' calls are "an extremely high-pitched chip, often repeated, and a thin penetrating trill".
ID text from Wikipedia, CC BY-SA 4.0
Yellow-throated Chlorospingus
Chlorospingus flavigularis
The two subspecies of the "yellow-throated" group of the yellow-throated chlorospingus are about 15 cm (5.9 in) long and weigh 21.5 to 31 g (0.76 to 1.1 oz). The sexes have the same plumage. Adults of the nominate subspecies C. f. flavigularis have gray lores. Their rest of their face and their crown, nape, upperparts, and tail are yellowish olive. Their flight feathers are dusky with dull yellow edges. Their throat is yellow, with the color extending sideways onto the neck. Voice: The dawn song of the yellow-throated chlorospingus in Colombia is "a short, weak and high-pitched chit, twee-twee-twee-twit in steady series of more or less alternating notes". On the western slope in Ecuador it is "a monotonous series of high-pitched tsit notes at a rate of about 2/second" and on the eastern slope "a steady series of 2 alternating notes, tsuw-tseét, tsuw-tseét...".
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: Dusky Chlorospingus and Yellow-throated Chlorospingus.