Animalia > Chordata > Aves > Accipitriformes > Accipitridae > Buteo > Buteo polyosoma

Buteo polyosoma (Variable Hawk)

Synonyms: Falco polyosoma (homotypic); Geranoaetus polyosoma (homotypic); Geranoaetus polyosoma fjeldsai; Geranoaetus polyosoma polyosoma

Wikipedia Abstract

The variable hawk (Geranoaetus polyosoma) is a polymorphic species of bird of prey in the Accipitridae family. It is widespread and often common in open habitats in western and southern South America, including the Falkland Islands. Its taxonomy is disputed, with some splitting it into the widespread red-backed hawk (G. polyosoma) and the Puna hawk or Gurney's hawk (G. poecilochrous) of the central and north Andean highlands, but the differences between the two are unclear. Most recent authorities have supported the lumping together of the two hawks although the issue still is controversial. On the contrary, the rare taxon from the Juan Fernández Islands is relatively distinctive, and possibly worthy of species recognition as the Juan Fernández hawk (B. exsul). In this article and most cur
View Wikipedia Record: Buteo polyosoma

Infraspecies

Buteo polyosoma exsul (Juan Fernandez Hawk)
Buteo polyosoma polyosoma

EDGE Analysis

Uniqueness Scale: Similiar (0) 
2
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
16
 Unique & Vulnerable (100)
ED Score: 5.21995
EDGE Score: 1.82776
Learn more at EDGE of Existence programme

Attributes

Adult Weight [1]  2.094 lbs (950 g)
Male Weight [4]  1.534 lbs (696 g)
Diet [2]  Carnivore (Vertebrates)
Diet - Endothermic [2]  100 %
Forages - Ground [2]  100 %
Clutch Size [3]  2
Raptor Research Conservation Priority [5]  97
Wing Span [1]  4.067 feet (1.24 m)

Ecoregions

Protected Areas

Biodiversity Hotspots

Name Location Endemic Species Website
Chilean Winter Rainfall-Valdivian Forests Chile No
Tropical Andes Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela No
Tumbes-Choco-Magdalena Colombia, Ecuador, Panama, Peru No

Prey / Diet

Prey / Diet Overlap

Range Map

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Leaflet | © OpenStreetMap contributors

External References

Citations

Attributes / relations provided by
♦ 1On the allometry of wings, Enrique Morgado, Bruno Günther and Urcesino Gonzalez, Revista Chilena de Historia Natural 60: 71-79, 1987
♦ 2Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014. EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
♦ 3Jetz W, Sekercioglu CH, Böhning-Gaese K (2008) The Worldwide Variation in Avian Clutch Size across Species and Space PLoS Biol 6(12): e303. doi:10.1371/journal.pbio.0060303
♦ 4Cabot J and de Vries T (2003) Buteo polyosoma and Buteo poecilochrous are two distinct species. Bulletin of the British Ornithologists' Club 123:190-207
♦ 5Buechley ER, Santangeli A, Girardello M, et al. Global raptor research and conservation priorities: Tropical raptors fall prey to knowledge gaps. Divers Distrib. 2019;25:856–869. https://doi.org/10.1111/ddi.12901
♦ 6Predation upon small mammals in shrublands and grasslands of southern South America: ecological correlates and presumable consequences, Fabian M. Jaksic, Revista Chilena de Historia Natural 59: 209-221 (1986)
♦ 7Population growth and density, diet and breeding success of striated caracaras Phalcoboenus australis on New Island, Falkland Islands, Paulo Catry, Miguel Lecoq, Ian J. Strange, Polar Biology Volume 31, Number 10, 1167-1174
♦ 8Ctenomys talarum, Enrique R. Justo, Luciano J. M. De Santis, and Marta S. Kin, MAMMALIAN SPECIES No. 730, pp. 1–5 (2003)
♦ 9Microcavia australis, Marcelo F. Tognelli, Claudia M. Campos, and Ricardo A. Ojeda, MAMMALIAN SPECIES No. 648, pp. 1–4 (2001)
♦ 10Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
Ecoregions provided by World Wide Fund For Nature (WWF). WildFinder: Online database of species distributions, ver. 01.06 Wildfinder Database
Biodiversity Hotspots provided by Critical Ecosystem Partnership Fund
Abstract provided by DBpedia licensed under a Creative Commons License
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0