Gorgeted Woodstar
Chaetocercus heliodor
The gorgeted woodstar is 5.8 to 6.4 cm (2.3 to 2.5 in) long. It is the smallest woodstar, a group of species that collectively are among the world's smallest birds. Both sexes have a straight black bill. The nominate male is mostly dark metallic blue-green. It has a pinkish purple gorget that extends across the neck, a grayish line behind the eye, a grayish breast, and white spots on the flanks. The tail is forked, with very short central feathers and outer ones that are bare shafts. The nominate female's upperparts are bronzy green with a rufous rump. Voice: The gorgeted woodstar makes "a single dry 'chit', doubled 'chichit' or tripled 'chichichit'" calls while hovering or feeding.
ID text from Wikipedia, CC BY-SA 4.0
White-bellied Woodstar
Chaetocercus mulsant
The white-bellied woodstar is about 8.5 cm (3.3 in) long and weighs about 3.8 to 4 g (0.13 to 0.14 oz). Both sexes have a straightish black bill. The male's upperparts are dark bluish green which continues onto the flanks. A downcurving white line behind the eye meets the white upper breast. Its gorget is iridescent reddish violet. The belly is white as are patches on the flanks. The forked tail is bluish green and its outermost feathers are shafts with no vanes. The female is bronzy green above. It has a grayish "mask" and a buff stripe behind the eye. Voice: The white-bellied woodstar's calls include "a rather low-pitched 'djup' note and higher-pitched dull 'chip'."
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: Gorgeted Woodstar and White-bellied Woodstar.