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Long-winged Harrier
Circus buffoni

Status: Lower risk

Population Trend: Unknown.

Other Names: Circus brasiliensis

Circus buffoni
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Distribution: Neotropical.  Southwestern COLOMBIA through VENEZUELA to the GUIANAS, and northeastern BRAZIL (Pará and Maranhão), south to eastern BOLIVIA, PARAGUAY, northern and central ARGENTINA, URUGUAY, and central CHILE; TRINIDAD. more....

Subspecies: Monotypic.

Taxonomy: Formerly called C. brasiliensis, but Amadon (1954) and Banks and Dove (1992) showed that the name was applied to another species. Wink and Sauer-Gürth (2000, 2004) found that this species is not in the clade consisting of C. cyaneus, C. hudsonius, C. cinereus, C. macrourus, and C. maurus, based on an analysis of nucleotide sequences of the mitochondrial gene, cytochrome b.

Movements: Southernmost populations are migratory. Regarded as an austral partial migrant by Short (1975) and Chesser (1994), and post-breeding wanderers occur in portions of northern Argentina, Bolivia, Peru, and Brazil, including some areas where it does not breed.

Habitat and Habits: Found over marshlands, flooded llanos, wet pastures, open fields, and along roads in lowlands below 1,000 m. Flies or soars low over the ground in typical harrier style and also hovers. Perches on the ground, but rarely on fenceposts. Avoids areas of human habitation and is generally solitary. more....

Food and Feeding Behavior: Feeds mainly on frogs, small mammals, cavies, and a few birds. Quarters low over wetlands, occasionally hovering and then dropping into the grass feet first to capture prey. more....

Breeding: The nest is placed on the ground in wet grassy areas. Clutch size is 2 eggs, which are bluish-white and unmarked. more....

Conservation: Widespread, but local and poorly known in most parts of its range. Its breeding distribution and seasonal movements are still not well documented. It is not know if birds seen at the northern extremes of its recorded range are austral migrants or post-breeding wanderers from breeding populations in northern South America (Angehr 2011). Categorized as a species of "Least Concern" by BirdLife International.

Important References: 
Amadon, D. 1954. On the correct name for the caracaras and for the
  Long-winged Harrier. Auk 71:203-204.
Amadon, D. 1964. Taxonomic notes on birds of prey. American Museum
  Novitates no. 2166.
Areta, J.I. 2007. (Abstact) Clinal variation in the proportion of color
  morphs in the Long-winged Harrier (Circus buffoni) in Argentina. P. 261 in
  K.L. Bildstein, D.R. Barber, and A. Zimmerman (eds.), Neotropical
  ornithology. Hawk Mountain Sanctuary, Orwigsburg, PA.
Bierregaard, R.O. 1994. Long-winged Harrier. P. 138 in del Hoyo, J., A.
  Elliott, and J. Sargatal (eds). Handbook of birds of the world. Vol. 2. New
  World vultures to guineafowl. Lynx Edicions, Barcelona, Spain.
Bó, M.S., S.M. Cicchino, and M.M. Martínez. 1996. Diet of Long-winged
  Harrier (Circus buffoni) in southeastern Buenos Aires Province, Argentina.
  Journal of Raptor Research 30:237-239.
Ferguson-Lees, J., and D.A. Christie. 2001. Raptors of the world. Houghton
  Mifflin, Boston, MA.
Simmons, R. 2000. Harriers of the world: their behaviour and ecology.
  Oxford University Press, Oxford, UK.
Voous, K.H. 1969. Predation potential in birds of prey from Surinam. Ardea

Sites of Interest:
Long-winged Harrier photos.
Aves de Rapina do Brasil
Species account with emphasis on Brazil.

Azevedo, Marcos Antônio Guimarães
Leveau, Lucas
Olivo Quiroga, Cristian E.
Scott, Don

Last modified: 7/28/2011

Recommended Citation: Global Raptor Information Network. 2020. Species account: Long-winged Harrier Circus buffoni. Downloaded from http://www.globalraptors.org on 4 Jun. 2020

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