Falco ardosiaceus (Grey kestrel) 

Donker grysvalk [Afrikaans]; Donkergrysvalk [Afrikaans]; Grijze torenvalk [Dutch]; Faucon ardoisé [French]; Graufalke [German]; Falcão-cinzento [Portuguese]

Life > Eukaryotes > Opisthokonta > Metazoa (animals) > Bilateria > Deuterostomia > Chordata > Craniata > Vertebrata (vertebrates)  > Gnathostomata (jawed vertebrates) > Teleostomi (teleost fish) > Osteichthyes (bony fish) > Class: Sarcopterygii (lobe-finned fish) > Stegocephalia (terrestrial vertebrates) > Tetrapoda (four-legged vertebrates) > Reptiliomorpha > Amniota > Reptilia (reptiles) > Romeriida > Diapsida > Archosauromorpha > Archosauria > Dinosauria (dinosaurs) > Saurischia > Theropoda (bipedal predatory dinosaurs) > Coelurosauria > Maniraptora > Aves (birds) > Order: Falconiformes > Family: Falconidae

Falco ardosiaceus (Grey kestrel)  

Grey kestrel, Kunene River Lodge, Namibia. [photo Trevor Hardaker ©]

 

Distribution and habitat

Occurs in sub-Saharan Africa from Senegal to Eritrea south through Uganda, western Tanzania, southern and eastern DRC and Angola to the extreme north of Namibia, specifically the Owambo and north-eastern Kunene regions. It generally prefers open clearings in Northern lala palm (Hyphaene petersiana), savanna and Mopane(Colosphermum mopane) woodland, usually cleared by grazing and cultivation.

Distribution of Grey kestrel in southern Africa, based on statistical smoothing of the records from first SA Bird Atlas Project (© Animal Demography unit, University of Cape Town; smoothing by Birgit Erni and Francesca Little). Colours range from dark blue (most common) through to yellow (least common).

Movements and migrations

Resident.

Food 

It mainly eats insects and lizards, often hunting from a perch and gliding to the ground to grab its prey; it may also chase birds and bats aerially. The following food items have been recorded in its diet:

  • Animals
    • insects
    • lizards
    • small birds
    • bats
    • rodents
  • Husks of Hyphaene petersiana (Northern lala palm)

Breeding

  • Little known in southern Africa, as only one nest has ever been recorded in the region; it is however known to be a monogamous, territorial solitary nester.
  • The only nest ever found in Namibia was a cavity near the top of a dead palm trunk.
  • Egg-laying season is probably in early to mid September.
  • It lays 3-5 eggs (recorded in Kenya), which incubated mostly by the female for an estimated 30 days, while the male feeds her at the nest.
  • The chicks stay in the nest for roughly four weeks.

Threats

Not threatened globally, in fact it appears to have benefited from the clearing of dense woodland and forest, although its favoured Northern lala palm savanna habitat is threatened by locals killing trees for their sap. It now has an estimated Namibian population of 40 breeding pairs.

References

  • Hockey PAR, Dean WRJ and Ryan PG 2005. Roberts - Birds of southern Africa, VIIth ed. The Trustees of the John Voelcker Bird Book Fund, Cape Town. 

 

 

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