Red-billed Emerald
Chlorostilbon gibsoni
The red-billed emerald is 7.6 to 9 cm (3.0 to 3.5 in) long and weighs about 2.8 g (0.099 oz). The males of all three subspecies have a straight bill with a mostly red mandible. The females' mandibles are red at the base. The bills are about 1.3 cm (0.51 in) long. Males of the nominate subspecies have dark bronze-green upperparts and a deeply forked blue-black tail. Their faces and underparts are glittering green to golden green. Nominate females are shining green above and plain gray below with dusky cheeks and a short white line behind the eye. Voice: The red-billed emerald's song is "a continuous series of wiry trilled notes, 'wirrr...wirrr...wirrr...'". It also makes "high-pitched penetrating 'tseeee' and a reedy 'tzreee'" calls.
ID text from Wikipedia, CC BY-SA 4.0
Short-tailed Emerald
Chlorostilbon poortmani
The male short-tailed emerald is 6.9 to 8.5 cm (2.7 to 3.3 in) long and females 6.5 to 7.5 cm (2.6 to 3.0 in). The species weighs between 3 and 4 g (0.11 and 0.14 oz). Both sexes of both subspecies have a straight black bill. Males of the nominate subspecies have an iridescent green forehead and bronzy green crown, upperparts, and uppertail coverts. Their underparts are brilliant glittery green. Their tail is short, forked, and iridescent bronze green. Nominate females have a dull green forehead and a dull bronzy green crown, upperparts, and uppertail coverts. Their underparts are gray. Voice: What is thought to be the short-tailed emerald's song is "a long series of high-pitched tseep notes" that is thought to be sung only in the wet season. It also makes "repeated short tsip and longer downslurred plaintive tsew...tsew.." calls.
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: Red-billed Emerald and Short-tailed Emerald.