Green Thorntail
Discosura conversii
Male green thorntails are about 9.5 to 10.2 cm (3.7 to 4.0 in) long and females about 6.6 to 7.5 cm (2.6 to 3.0 in). Five individuals whose sex was not recorded had an average weight of 3.0 g (0.11 oz). The adult male has a dark green crown and a lighter more metallic green back. The coppery bronze rump has bluish black inclusions and a white band across it. The bluish black tail is deeply forked and the outer feathers are very narrow, giving the species its common name. Voice: The green thorntail is usually silent, but makes "soft, squeaky chipping in interactions".
ID text from Wikipedia, CC BY-SA 4.0
Wire-crested Thorntail
Discosura popelairii
The wire-crested thorntail is one of the smallest birds on Earth, with a mature weight of about 2.5 g (0.088 oz). Males are about 11.4 cm (4.5 in) long, including tail extension, and females about 7.5 to 8.2 cm (3.0 to 3.2 in). Adults of both sexes have coppery green upperparts with a white band across the rump. Males have a glittering green crown with a thin hair-like crest. Its gorget is iridescent green, the flanks brownish with a white patch, and the rest of the underparts black. Voice: The only wire-crested thorntail vocalization that has been described is a "quiet, somewhat liquid 'tew'."
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: Green Thorntail and Wire-crested Thorntail.