JWL6017 Kestrel... - a photo on Flickriver

            Kestrel - Falco tinnunculus (Juveniles)
 
The common kestrel (Falco tinnunculus) is a bird of prey species belonging to the kestrel group of the falcon family Falconidae. It is also known as the European kestrel, Eurasian kestrel, or Old World kestrel. In Britain, where no other kestrel species occurs, it is generally just called "the kestrel".

This species occurs over a large range. It is widespread in Europe, Asia, and Africa, as well as occasionally reaching the east coast of North America.

Kestrels can hover in still air, even indoors in barns. Because they face towards any slight wind when hovering, the common kestrel is called a "windhover" in some areas.

Unusual for falcons, plumage often differs between male and female, although as is usual with monogamous raptors the female is slightly larger than the male. This allows a pair to fill different feeding niches over their home range. Kestrels are bold and have adapted well to human encroachment, nesting in buildings and hunting by major roads. Kestrels do not build their own nests, but use nests built by other species.

Their plumage is mainly light chestnut brown with blackish spots on the upperside and buff with narrow blackish streaks on the underside; the remiges are also blackish. Unlike most raptors, they display sexual colour dimorphism with the male having fewer black spots and streaks, as well as a blue-grey cap and tail. The tail is brown with black bars in females, and has a black tip with a narrow white rim in both sexes. All common kestrels have a prominent black malar stripe like their closest relatives.

The cere, feet, and a narrow ring around the eye are bright yellow; the toenails, bill and iris are dark. Juveniles look like adult females, but the underside streaks are wider; the yellow of their bare parts is paler. Hatchlings are covered in white down feathers, changing to a buff-grey second down coat before they grow their first true plumage.

Data from Britain shows nesting pairs bringing up about 2–3 chicks on average, though this includes a considerable rate of total brood failures; actually, few pairs that do manage to fledge offspring raise less than 3 or 4. Compared to their siblings, first-hatched chicks have greater survival and recruitment probability, thought to be due to the first-hatched chicks obtaining a higher body condition when in the nest. Population cycles of prey, particularly voles, have a considerable influence on breeding success. Most common kestrels die before they reach 2 years of age; mortality up until the first birthday may be as high as 70%. At least females generally breed at one year of age; possibly, some males take a year longer to maturity as they do in related species. The biological lifespan to death from senescence can be 16 years or more, however; one was recorded to have lived almost 24 years.

Population:

UK breeding:

46,000 pairs

Taken on: July 6, 2020

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