Bearded helmetcrest

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Bearded helmetcrest
Oxypogon guerinii lindenii.jpg
Oxypogon lindenii
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Apodiformes
Family: Trochilidae
Genus: Oxypogon
Gould, 1848
Species

O. lindenii
O. guerinii
O. stubelii
O. cyanolaemus

The bearded helmetcrests (Oxypogon) are a genus of hummingbird in the family Trochilidae. They are found in Colombia and Venezuela. Primary natural habitat is subtropical or tropical high-altitude grassland, known as páramo. 4 different species of this genus were recognized in 2014. [1]

Species[edit]

The Oxypogon genus was first described by French ornithologist Auguste Boissonneau in 1840. A study of mitochondrial DNA of hummingbirds shows it to be most closely related to the bearded mountaineer (Oreonympha nobilis) and the rufous-capped thornbill (Chalcostigma ruficeps). The other member of the genus Chalcostigma lay outside the group, suggesting the genus might need revising in the future.[2]

The most common species, the white-bearded helmetcrest measures 114 mm (4.5 in) in length, it is a small hummingbird with a very small 8 mm (0.3 in) bill. The adult male has a distinctive pointed black crest and a shaggy white beard. The face and cheeks are blackish, rendering a triangular shape with the white fronted crest and white beard. The underparts are a dull green-grey. The female lacks the beard and crest.[3][4]

The species of bearded helmetcrests are found in the Andes, ranging from altitudes of 3600 to 4500 m (12000–15000 ft) in Venezuela,[4] and 3200 to 5200 m (10500 to 17000 ft) in Colombia.[3] Its main habitat is the páramo, but can descend to the treeline outside of breeding season.[4]

All species often perch on boulders and flit between low-flowering shrubs, visiting the flowers of the genera Espeletia, Echeveria, Siphocampylus, Castilleja and Draba.[4]

All species breed during the rainy season, and nests in in the daisy Espeletia or builds a nest of material from the daisy in a cliff or bank.[4]

References[edit]

  1. ^ url=http://www.museum.lsu.edu/~Remsen/SACCprop609.htm
  2. ^ McGuire, Jimmy A.; Witt Christopher C.; Remsen, J. V. Jr; Dudley R.; Altshuler, Douglas L. (2008). "A higher-level taxonomy for hummingbird". Journal of Ornithology 150: 155–65. doi:10.1007/s10336-008-0330-x. 
  3. ^ a b Steven L. Hilty, Bill Brown (1986). A guide to the birds of Colombia. Princeton University Press. p. 295. ISBN 0-691-08372-X. Retrieved 12 June 2011. 
  4. ^ a b c d e Steven L. Hilty, Rodolphe Meyer de Schauensee (2003). Birds of Venezuela. Princeton University Press. p. 432. ISBN 0-691-09250-8. Retrieved 12 June 2011.