|Male (right) and females|
|Nesting area Wintering area All-year resident|
The lesser kestrel (Falco naumanni) is a small falcon. This species breeds from the Mediterranean across southern central Asia to China and Mongolia. It is a summer migrant, wintering in Africa and Pakistan and sometimes even to India and Iraq. It is rare north of its breeding range, and declining in its European range. The scientific name of this bird commemorates the German naturalist Johann Andreas Naumann.
It is a small bird of prey, 27–33 cm in length with a 63–72 cm wingspan. It looks very much like the larger common kestrel but has proportionally shorter wings and tail. It shares a brown back and barred grey underparts with the larger species. The male has a grey head and tail like male common kestrels, but lacks the dark spotting on the back, the black malar stripe, and has grey patches in the wings.
The female and young birds are slightly paler than their relative, but are so similar that call and structure are better guides than plumage. The call is a diagnostic harsh chay-chay-chay, unlike the common kestrel's kee-kee-kee. Neither sex has dark talons as is usual in falcons; those of this species are a peculiar whitish-horn color. This, however, is only conspicuous when birds are seen at very close range, e.g. in captivity.
Despite its outward similarity, this species appears not to be closely related to the common kestrel. In fact, mtDNA cytochrome b sequence analysis (Groombridge et al. 2002) places it at a basal position with regards to the other "true" kestrels (i.e., excluding the American kestrel and probably the grey African kestrels too). Its divergence is tentatively placed to around the Miocene-Pliocene boundary (Messinian to Zanclean, or about 7-3.5 mya). The morphological similarity with the common kestrel is most puzzling, but still it appears to betray the present species' actual relationships: the lack of a malar stripe seems ancestral for kestrels, and the grey wing colour unites the lesser kestrel with most other Falco species, but not the other true kestrels.
The lesser kestrel is, as the name implies, a smaller and more delicate bird than the common kestrel, and it is entirely sympatric in its breeding range with it; they compete to a limited extent. Thus, the possibility that there is some form of adaptive advantage to the similar coloration deserves study. Considering that the lesser kestrel would in fact have an advantage if some would-be predators confused it with the larger species and consequently avoided it, it might be a case of Müllerian mimicry.
The lesser kestrel eats insects, but also small birds, reptiles and rodents (especially mice), which are often taken on the ground. It nests colonially on buildings, cliffs, or in tree holes, laying up to 3-6 eggs. No nest structure is built, which is typical for falcons. On their wintering grounds in West Africa, lesser kestrels favor a "latitude belt" through Senegal where locusts and grasshoppers are plentiful. Surveys of lesser kestrels wintering in January 2007 by Ligue pour la Protection des Oiseaux revealed them roosting communally. A roost in Senegal discovered during one of the surveys held 28,600 birds, together with 16,000 scissor-tailed kites Chelictinia riocourii.
It is widespread and plentiful on a global scale, and the IUCN have classed it as Least Concern. Apart from possible habitat destruction, it appears that indiscriminate use of pesticides has a strong effect on this species due to its insectivorous habits.
From John Gould's Birds of Europe.
Lesser kestrel with insect. Notice yellow talons - an easy way to distinguish between lesser and common kestrel
- BirdLife International (2013). "Falco naumanni". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- Groombridge, Jim J.; Carl Jones; Bayes, Michelle K.; van Zyl, Anthony J.; Carrillo, José; Nichols, Richard A. & Bruford, Michael W. (2002): A molecular phylogeny of African kestrels with reference to divergence across the Indian Ocean. Molecular Phylogenetics and Evolution 25(2): 267–277. doi:10.1016/S1055-7903(02)00254-3 (HTML abstract)
- "Falco_naumanni". Animal Diversity Web. University of Michigan. Retrieved 2008-12-01.
- Surveys reveal raptor ‘super-roost’
- BirdLife International (2006) Lesser Kestrel - BirdLife International Species Factsheet. Retrieved 2007-MAR-1.
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