Réunion kestrel
| Réunion kestrel | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Falconiformes |
| Family: | Falconidae |
| Genus: | Falco |
| Species: | F. duboisi |
| Binomial name | |
|
Falco duboisi Cowles, 1994 |
|
The Réunion kestrel (Falco duboisi) is an extinct bird of prey which belongs to the falcon family. It inhabited the Mascarene island of Réunion and was part of the Western Indian Ocean radiation of kestrels.
Known from subfossil bones and the writings of Dubois published in 1674, this bird was larger than its relative F. punctatus on Mauritius, being about the size of a common kestrel, or around 35 cm from head to tail, with males being noticeably smaller than females. This trait, while present in most birds of prey, is most pronounced in the larger, bird-eating species and reduces between-sex competition by niche differentiation. It can be assumed that the bird was of the same generally brownish coloration as its closest relatives, with a lighter underside and darker spots or stipples, the tail, brown or more probably grey, being banded and tipped black. Its feet were yellow and large relative to the bird's overall size. The wingspan was 60–70 cm, its wings being more rounded than those of the common kestrel - just as in the Mauritius bird - for increased maneuvrability when hunting in the forest. It is probable, but not certain, that the only difference between the sexes was their size. The bird fed mainly on birds, but certainly also on insects and the local gecko; Dubois noted that despite their small size they were able to prey on (presumably half-grown) domestic chickens.
Dubois mentioned three kinds of birds of prey extant on Réunion in the early 1670s: in order of decreasing size, papangues (the local marsh harrier which still exists), pieds jaunes ("yellow-feet") and émerillons (a term for small falcons like the merlin). It is not quite clear what name refers to the Réunion kestrel. From reviewing the evidence, the bird was most probably the émerillon, with the pieds jaunes being either migrant falcons (the only species that might occur in the area, the sooty falcon, Eleonora's falcon and the peregrine falcon, are larger than F. duboisi was, if not in overall length, then at least in wingspan) or the juveniles of the marsh harrier, which are distinctly colored and also have yellow feet. The latter explanation seems more likely as the name was unequivocally applied to young marsh harriers in the late 19th century. Nonetheless, it seems remotely possible that the Réunion falcon's sexes were not only of different size, but also differently colored. In this case, the males would be the émerillons and the females the pieds jaunes.
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