Snowcap
Microchera albocoronata
The snowcap is 6.5 to 7 cm (2.6 to 2.8 in) long and weighs about 2.7 g (0.095 oz). Both sexes of both subspecies have a short black bill and black legs. Adult males of both subspecies have the white forehead and crown that give this species its English and scientific names. Males of the nominate subspecies have dark purple upperparts with a purplish black nape and a reddish gloss on the back, rump, and uppertail coverts. Their face and underparts are black with a reddish purple gloss. Their central tail feathers are metallic bronze and the rest have white bases and black ends. Males of M. a. Voice: The male snowcap's song is "a soft, sputtering, warbling melody: tsitsup tsitsup tsitsup tsew ttttt-tsew or tsip-tsee tsippy tsippy tsippy tsip-tick tsew." One call is "a soft, high-pitched, dry tsip", and it makes "buzzy notes and chatters in aggressive interactions".
ID text from Wikipedia, CC BY-SA 4.0
White-tailed Emerald
Microchera chionura
The white-tailed emerald is 7.5 to 8 cm (3.0 to 3.1 in) long. Males weigh about 3.3 g (0.12 oz) and females 3.1 g (0.11 oz). Both sexes have an almost straight black bill whose mandible has a pinkish base. The adult male has bronzy green upperparts that becomes dark copper-bronze on the uppertail coverts. Its central two pairs of tail feathers are copper-bronze and the other three pairs white with black tips. It has a glittering green throat and chest and white belly, vent, and undertail coverts. The adult female also has bronzy green upperparts. Voice: The white-tailed emerald's song is "a prolonged, thin scratchy twittering mixed with buzzing or gurgling notes". It also makes "soft scratchy chipping notes" when foraging and "high-pitched, buzzy notes" when chasing.
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: Snowcap and White-tailed Emerald.