Greater Kestrel

Taxobox
name = Greater Kestrel
status = LC
status_system = iucn3.1

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image_width = 240px
regnum = Animalia
phylum = Chordata
classis = Aves
ordo = Falconiformes
familia = Falconidae
genus = "Falco"
species = "F. rupicoloides"
binomial = "Falco rupicoloides"
binomial_authority = Smith, 1829
range_

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range_map_width = 240px

The Greater Kestrel or White-eyed Kestrel ("Falco rupicoloides") is a bird of prey belonging to the falcon family Falconidae. It is one of the largest kestrels and is found in open country in southern and eastern Africa.

Description

The plumage of the adult is mainly pale rufous, both above and below. The back, upperwing and flanks are barred with black. The breast has dark streaks and the head is streaked but has no malar stripe unlike the Common and Lesser Kestrels. The rump and tail are grey with black bars; the tail has a white tip. In flight, the whitish underwing contrasts with the darker body. The iris of the eye is whitish, distinguishing the bird from any similar species. The bill is mainly blue-grey and the feet and cere are yellow. Juvenile birds have rufous instead of grey on the tail, streaked flanks and a dark eye.

The bird is 29-37 cm long with a wingspan of 68-84 cm. The southern subspecies "F. r. rupicoloides" weighs about 181-334 grams. The form "F. r. arthuri" is smaller, weighing about 165-252 grams. The northern subspecies "F. r. fieldi" is also small and is paler than the others.

The species is usually silent but has a shrill, repeated call.

Habitat and range

It occurs in open, arid areas where it inhabits grassland, savannas and semi-desert. It is often associated with acacias. It prefers areas where the ground cover is lower than 50 cm. It is found from sea-level up to 2,150 metres, particularly between 800 and 1800 metres.

It is fairly common and widespread in the southern parts of its range but is scarce and patchily distributed further north. The form "F. r. rupicoloides" breeds in Namibia, Botswana, Zimbabwe, parts of Angola and Zambia and in much of South Africa apart from the wetter regions of the south and east. "F. r. arthuri" is found in Kenya and northern Tanzania while "F. r. fieldi" occurs in Ethiopia, Eritrea, northern Somalia and probably northern Kenya.

The total range covers about 3.5 million km². The population is stable and is likely to be in the order of 100,000 to 200,000 pairs. Most birds are sedentary but some are nomadic or dispersive.

Feeding

The Greater Kestrel usually hunts from an exposed perch such as a tree or rock. It also hovers like several other kestrels. It feeds mainly on invertebrates such as grasshoppers, termites, beetles and solifugids. It also takes lizards and sometimes small birds, mammals and snakes. It mainly catches prey on the ground. It is attracted to fires where it catches insects and other prey as they flee from the flames. Excess food may be cached underneath vegetation or stones.

Reproduction

The breeding season varies between different regions. In the south it lasts from July to April with a peak between September and December. Breeding takes place in all months in Kenya and Tanzania but is concentrated between April and July. The season lasts from April to August in Somalia.

Greater Kestrels use the old nest of another bird for breeding, such as that of a Cape Crow or Pied Crow. A typical site is between 2 and 20 metres above the ground in a tree or sometimes on a telegraph pole or pylon. Two to seven eggs are laid with three or four being most common. They are incubated for 22 to 23 days, mainly by the female. The young birds fledge after 30 to 34 days and remain dependent on their parents for at least 26 days longer.

References

*aut|Channing, Keith (2007) " [http://www.hawk-conservancy.org/priors/greaterkestrel.shtml The Hawk Conservancy Trust: Greater or White-eyed Kestrel - Falco rupicoloides.] " Accessed 01/07/07.
*aut|Ferguson-Lees, James & Christie, David A. (2001) "Raptors of the World", Christopher Helm, London.
*aut|Global Raptor Information Network (2007) " [http://www.globalraptors.org/grin/SpeciesResults.asp?specID=8250 Species account: White-eyed Kestrel Falco rupicoloides.] " Downloaded from http://www.globalraptors.org on 1 Aug. 2007.
*aut|Sinclair, Ian & Ryan, Peter (2003) "Birds of Africa south of the Sahara", Struik, Cape Town.
*aut|Zimmerman, Dale A.; Turner, Donald A. & Pearson, David J. (1999) "Birds of Kenya & Northern Tanzania", Christopher Helm, London.