Andean Hillstar
Oreotrochilus estella
The Andean hillstar is 13 to 15 cm (5.1 to 5.9 in) long. Males weigh about 8.8 g (0.31 oz) and females about 8.0 g (0.28 oz). Adults have a medium length slightly decurved black bill. The adult male of the nominate subspecies has drab brown upperparts. It has a shiny green gorget with a black border that separates it from the white breast and belly. The belly has a rufous stripe down its middle into the vent area. The forked tail's central pair of feathers are bronzy black; the rest are mostly white with bronzy black edges and tips on the outermost. Voice: The Andean hillstar makes "a repeated short 'tsip' or 'swit', and while chasing, "a rapid, melodious, passerine-like twittering".
ID text from Wikipedia, CC BY-SA 4.0
White-sided Hillstar
Oreotrochilus leucopleurus
The white-sided hillstar is 13 to 15 cm (5.1 to 5.9 in) long and weighs 7.9 to 8.4 g (0.28 to 0.30 oz). Adults have a medium length slightly decurved black bill. The adult male has drab brown upperparts. It has a shiny green gorget with a black border that separates it from the white breast and belly. The belly has a wide blue-black stripe down its middle into the vent area. The somewhat rounded tail is bronzy black and its outer feathers have white at the base. The female is also dull brown above, and below as well. Its throat is pale with fine dark speckles. Voice: The white-sided hillstar's vocalizations are not well known. It does make "a repeated short 'tsit'" call and also "a fast twittering during chasing or display".
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: Andean Hillstar and White-sided Hillstar.