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The Andean hillstar (Oreotrochilus estella) is a species of hummingbird in the family Trochilidae. It is found in grassland, scrub and woodland in the Altiplano of southern Peru, Bolivia, northern Chile, and north-western Argentina.[2] It often includes the green-headed hillstar as a subspecies, but the male of that species has a black (not brown) stripe to the central underparts, and its upperparts are greener. Additionally, the green-headed hillstar is more closely related to the black-breasted hillstar and blue-throated hillstar than the Andean hillstar.[2][3]

Andean hillstar
Andean Hillstar (Oreotrochilus estella) perched.jpg
Male above, female below
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Family: Trochilidae
Genus: Oreotrochilus
O. estella
Binomial name
Oreotrochilus estella
Oreotrochilus estella map.svg
Combined distribution (green) of Andean and green-headed hillstars in South America

The species is unusually well adapted to cold nights in the Andes, which it survives by reducing its metabolic rate utilizing a state of torpor to something like that of hibernation in sheltered niches facing the rising sun.

See alsoEdit


  1. ^ BirdLife International (2012). "Oreotrochilus estella". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. ^ a b Handbook of the Birds of the World. Vol. 5, J. del Hoyo, A. Elliott & J. Sargatal (eds.), Barcelona, 1999.
  3. ^ Sornoza-Molina, F., J. F. Freile, J. Nilsson, N. Krabbe & E. Bonaccorso. 2018. A striking, critically endangered, new species of hillstar (Trochilidae: Oreotrochilus) from the southwestern Andes of Ecuador. Auk 135(4): 1146–1171.

External linksEdit