Grey kestrel (Falco ardosiaceus)

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Grey kestrel perched on branch
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Grey kestrel fact file

Grey kestrel description

KingdomAnimalia
PhylumChordata
ClassAves
OrderFalconiformes
FamilyFalconidae
GenusFalco (1)

The grey kestrel is a fairly small and stocky bird of prey with, as its common name suggests, entirely slate grey plumage, which contrasts strongly with its bright yellow eye ring, cere, legs and feet. The head is large, with a heavy black beak and brown eyes, the wings are fairly short and pointed, and the ends of the primary flight feathers are blackish (2) (4) (5). Potentially confused with the sooty falcon, Falco concolor, the grey kestrel is more heavily built, with shorter wings, which do not reach the end of the tail when the bird is perched (4) (6). Male and female grey kestrels are similar in appearance, but males are slightly smaller than the females, while juveniles can be distinguished by the brown wash to the plumage, the paler abdomen, and pale green facial skin (2) (4) (6). The grey kestrel flies with fast, shallow wing beats, interspersed with short glides, usually low over open ground or among trees, but hovering is not commonly seen. The call is a shrill keek-keek-keek, given at the nest, and sometimes a whistling scream (4) (5).

French
Faucon ardoisé.
Size
Length: 30 - 33 cm (2)
Male weight: 205 - 255 g (2)
Female weight: 240 - 300 g (2)
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Grey kestrel biology

The diet of the grey kestrel consists of insects, such as grasshoppers and flying termites, as well as small reptiles, rodents, birds, bats and even earthworms. It may also eat oil palm fruits, one of only three raptor species known to do so. Hunting is usually undertaken from a high, open perch, with the kestrel taking prey from the ground or from low foliage, though it may also chase birds and insects in flight (2) (4) (5). Nesting usually occurs between January and April in West Africa, and between August and October in Kenya, Tanzania and Angola (2), the breeding pair often taking over Hamerkop (Scopus umbretta) nests, even evicting the residents, or using tree cavities or old stick nests (2) (4) (5). Two to five eggs are laid, hatching after an incubation period of between 26 and 31 days. Fledging occurs after approximately 30 days (2) (4).

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Grey kestrel range

Most of sub-Saharan Africa, from Senegal east to Ethiopia and Eritrea, and as far south as Namibia, Zambia and Malawi (2) (4) (7). The grey kestrel is mostly sedentary, but may make some seasonal movements in parts of West Africa (4).

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Grey kestrel habitat

The grey kestrel inhabits woodland, wooded grassland and savanna, including palm savanna, often near clearings and burnt areas, where it regularly hunts (2) (4) (5). It can be found at elevations of up to 1,800 metres (4).

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Grey kestrel status

Classified as Least Concern (LC) on the IUCN Red List (1) and listed on Appendix II of CITES (3).

IUCN Red List species status – Least Concern

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Grey kestrel threats

The grey kestrel has a wide distribution and a large global population, and is not currently considered at risk of extinction (7). The species is probably the most common kestrel in sub-Saharan Africa (8), and is thought to readily adapt to human land-use, often hunting on agricultural land and possibly even benefitting from forest clearance (2) (4).

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Grey kestrel conservation

The grey kestrel is listed on Appendix II of the Convention on International Trade in Endangered Species (CITES), meaning that international trade in grey kestrels should be carefully monitored and controlled (3). However, there are no other known conservation measures currently in place for this species.

View information on this species at the UNEP World Conservation Monitoring Centre.
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Find out more

For more information on the grey kestrel and other birds of prey see:

For more information on raptor conservation see:

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Authentication

Authenticated (14/09/09) by Anthony Van Zyl, Western Cape Raptor Research Programme, Percy Fitzpatrick Institute of African Ornithology.
http://www.kestreling.com/

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Glossary

Cere
In birds, an area of skin at the base of the upper mandible surrounding the nostrils.
Incubation
The act of incubating eggs, that is, keeping them warm so that development is possible.
Primary flight feathers
In birds, the main flight feathers projecting along the outer edge of the wing.
Raptor
Bird of prey. Raptors are members of the taxonomic order Falconiformes.
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References

  1. IUCN Red List (January, 2009)
    http://www.iucnredlist.org/
  2. del Hoyo, J., Elliott, A. and Sargatal, J. (1994) Handbook of the Birds of the World. Volume 2: New World Vultures to Guineafowl. Lynx Edicions, Barcelona.
  3. CITES (January, 2009)
    http://www.cites.org/
  4. Ferguson-Lees, J. and Christie, D.A. (2001) Raptors of the World. Helm Identification Guides, A & C Black Publishers, London.
  5. Alden, P.C., Estes, R.D., Schlitter, D. and McBride, B. (1996) Collins Guide to African Wildlife. HarperCollins Publishers, London.
  6. Newman, K. (2002) Newman’s Birds of Southern Africa. Struik, Cape Town.
  7. BirdLife International (January, 2009)
    http://www.birdlife.org/datazone/species/index.html?action=SpcHTMDetails.asp&sid=3599&m=0
  8. Van Zyl, A. (September, 2009) Pers. comm.
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Image credit

Grey kestrel perched on branch  
Grey kestrel perched on branch

© Nik Borrow

Nik Borrow
n.borrow@btinternet.com
http://web.mac.com/nikborrow

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