The hillstars are
hummingbird
Hummingbirds are birds native to the Americas and comprise the Family (biology), biological family Trochilidae. With approximately 366 species and 113 genus, genera, they occur from Alaska to Tierra del Fuego, but most species are found in Cen ...
s of the genus ''Oreotrochilus''. They are native to the
Andes
The Andes ( ), Andes Mountains or Andean Mountain Range (; ) are the List of longest mountain chains on Earth, longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range ...
in
South America
South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern Subregion#Americas, subregion o ...
.
The ''
Urochroa'' hillstars are not closely related.
Species list
Their genus contains seven species:
Description
The birds are approximately in length with fairly long, slightly decurved black bills. They are
sexually dimorphic
Sexual dimorphism is the condition where sexes of the same species exhibit different Morphology (biology), morphological characteristics, including characteristics not directly involved in reproduction. The condition occurs in most dioecy, di ...
. The male usually has an
iridescent
Iridescence (also known as goniochromism) is the phenomenon of certain surfaces that appear gradually to change colour as the angle of view or the angle of illumination changes. Iridescence is caused by wave interference of light in microstruc ...
green throat, or bluish-purple in the Ecuadorian hillstar, with dull greenish upperparts and pale flanks. The central underparts are usually black, but are brown in the Andean hillstar. The tail is usually dark with a contrasting white pattern; the pattern is cinnamon in the wedge-tailed hillstar, and the tail is entirely dark in the black-breasted hillstar. The female is duller, with a whitish throat densely spotted with green, white,
buff
Buff or BUFF may refer to:
People
* Buff (surname), a list of people
* Buff (nickname), a list of people
* Johnny Buff, ring name of American world champion boxer John Lisky (1888–1955)
* Buff Bagwell, a ring name of American professional wr ...
, or cinnamon underparts, and a dark tail with a white pattern.
Behaviour
These highly
territorial
A territory is an area of land, sea, or space, belonging or connected to a particular country, person, or animal.
In international politics, a territory is usually a geographic area which has not been granted the powers of self-government, ...
hummingbirds are found in temperate and
alpine
Alpine may refer to any mountainous region. It may also refer to:
Places Europe
* Alps, a European mountain range
** Alpine states, which overlap with the European range
Australia
* Alpine, New South Wales, a Northern Village
* Alpine National P ...
grassland, scrub and woodland at altitudes of . The Ecuadorian hillstar has been observed nesting at high altitudes on the cliffs of
Cotopaxi
Cotopaxi () is an active stratovolcano in the Andes Mountains, located near Latacunga city of Cotopaxi Province, about south of Quito, and northeast of the city of Latacunga, Ecuador. It is the second highest summit in Ecuador (after Chim ...
. This species is known to
nest colonially.
Many hillstars feed mainly on
shrub
A shrub or bush is a small to medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees by their multiple ...
s of the Andean plant genus ''
'', and some species may be limited to them.
[Bleiweiss, R. (1982)]
The northern limit of the hummingbird genus ''Oreotrochilus'' in South America.
''The Auk'' 99(2), 376-78.
The genus has undergone
allopatric speciation
Allopatric speciation () – also referred to as geographic speciation, vicariant speciation, or its earlier name the dumbbell model – is a mode of speciation that occurs when biological populations become geographically isolated from ...
.
References
Further reading
* Fjeldså, J. and I. Heynen (1999). Genus ''Oreotrochilus''. pp. 623–24 In: del Hoyo, J., et al. (eds.) ''
Handbook of the Birds of the World
The ''Handbook of the Birds of the World'' (HBW) is a multi-volume series produced by the Spanish publishing house Lynx Edicions in partnership with BirdLife International. It is the first handbook to cover every known living species of bird. ...
.'' Vol. 5. Barn-owls to Hummingbirds. Lynx Edicions, Barcelona. 1999.
Birds of the Andes
Taxa named by John Gould
Taxonomy articles created by Polbot
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