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Buckley's Forest Falcon
Micrastur buckleyi

Status: Lower risk

Population Trend: Unknown.

Other Names: Buckley's Forest-falcon, Lesser Collared Forest-falcon, Traylor's Forest-falcon.


Micrastur buckleyi
click to enlarge
Distribution: Neotropical. Northwestern Amazonian region, including extreme southeastern COLOMBIA, southeastern VENEZUELA, eastern ECUADOR, eastern PERU, and western Amazonian BRAZIL. more....

Subspecies: Monotypic.

Taxonomy: This form was described by Swann (1919) from a male collected at Sarayacu, Ecuador as a race of the Collared Forest Falcon, M. semitorquatus, differing from other races by its smaller size. Hellmayr and Conover (1949) and Friedmann (1950) continued to treat it as a race of M. semitorquatus despite arguments advanced by Traylor (1948) that it is a separate species, based on its smaller size and plumage differences. Amadon (1964) described the first female and immature specimens of M. buckleyi and agreed that it is a distinct species, a treatment that has been followed by virtually all subsequent authorities.

Movements: Probably non-migratory.

Habitat and Habits: Inhabits interior of humid forest, second-growth, and forest edges of lowlands. Like other Micrastur species, it is partly crepuscular and vocalizes frequently before dawn and at dusk. Even among members of this genus, this species seems to be particularly inconspicuous and elusive and is detected consistently only by the used of taped calls.

Food and Feeding Behavior: May attend swarms of army ants to feed on reptiles and insects flushed by the ants.

Breeding: Valdez (2007) followed the nesting activities of a pair of these birds in two consecutive nesting seasons in southeastern Peru. A 27-m high cavity on a broken branch of a capirona tree (Calycophyllum spruceanum) was used in both years. Each clutch consisted of two reddish-brown eggs, which were laid in November and incubated by the female while the male guarded and provided food. Feathered nestlings were found in the nest in early January 2005, and the two eggs in 2006 hatched on 11 and 14 January, respectively. One of the two 2005 chicks survived to fledge in February. Recently fledged nestlings were recorded in eastern Ecuador in August 1995 (J. Arwin, fide Whittaker 2001).

Conservation: Still known from only 11 specimens and relatively few localities, mostly in eastern Ecuador (Whittaker 2001), but almost certainly frequently overlooked, or confused with the more common, but similar, M. semitorquatus. Using tape recordings, Whittaker (op cit.) found that the species occurs more commonly than previously suspected within its known range in northwestern Amazonia. Categorized globally as "Least Concern" by BirdLife International, but any classification must regarded as speculative until more is known about this species.

Important References: 
Amadon, D. 1964. Taxonomic notes on birds of prey. American Museum
  Novitates no. 2166.
Bierregaard, R.O. 1994. Buckley's Forest-falcon. P. 254 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.
Collar, N.J., L.P. Gonzaga, N. Krabbe, A. Madroño Nieto, L.G. Naranjo,
  T.A. Parker, III, and D.C. Wege.
1992. Threatened birds of the America: the
  ICBP/IUCN Red Data Book. International Council for Bird Preservation,
  Cambridge, UK.
Ferguson-Lees, J., and D.A. Christie. 2001. Raptors of the world. Houghton
  Mifflin, Boston, MA.
Kirke Swann, H. 1919. A synoptical list of the Accipitres. Wheldon and
  Wesley, London.
Traylor, Jr., M.A. 1948. New birds from Peru and Ecuador. Fieldiana,
  Zoology 31:195-200.
Valdez, U. 2007. (Abstract) Abundance and movement patterns of
  forest-falcons (Micrastur) in lowland Amazonian rainforest of
  southeastern Peru. Pp. 351-352 in K.L. Bildstein, D.R. Barber, and A.
  Zimmerman (eds.), Neotropical ornithology. Hawk Mountain Sanctuary,
  Orwigsburg, PA.
Valdez, U. 2007. (Abstract) Nest description and nesting biology of
  Buckley's Forest-falcon (Micrastur buckleyi) in southeastern Peru. Pp.
  353-354 in K.L. Bildstein, D.R. Barber, and A. Zimmerman
  (eds.), Neotropical ornithology. Hawk Mountain Sanctuary, Orwigsburg, PA.
Whittaker, A. 2001. Notes on the poorly-known Buckley's Forest-falcon
  Micrastur buckleyi including voice, range and first Brazilian records.
  Bulletin of the British Ornithologists' Club 121:198-208. more....

Sites of Interest:
Xeno-canto
Vocalizations.
Aves de Rapina do Brasil
Species account with emphasis on Brazil.

Researchers:
Gómez, César
Whittaker, Andrew

Last modified: 2/17/2011

Recommended Citation: Global Raptor Information Network. 2017. Species account: Buckley's Forest Falcon Micrastur buckleyi. Downloaded from http://www.globalraptors.org on 24 Feb. 2017








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