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| Common Buzzard | ||||||||||||||
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| Buteo buteo (Linnaeus, 1758) |
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 Dark green: All-year distribution
Light green/blue: Breeding/winter range of Steppe Buzzard. |
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7-10, see text |
The Common Buzzard (Buteo buteo) is a medium to large bird of prey, whose range covers most of Europe and extends into Asia. It is typically between 51-57 cm in length with a 110 to 130 cm (48-60 inch) wingspan, making it a medium-sized raptor. There are around 40,000 breeding pairs in Britain. It is usually resident all year except in the coldest parts of its range, and in the case of one subspecies.
It breeds in woodland, usually on the fringes, but favours hunting over open land. It eats mainly small mammals, and will come to carrion. A great opportunist, it adapts well to a varied diet of pheasant, rabbit, other small mammals, snakes & lizards & can often be seen walking over recently ploughed fields looking for worms & insects.
Buzzards do not normally form flocks, but several may be seen together on migration or in good habitat. The Victorian writer on Dartmoor, William Crossing, noted that he had on occasions seen flocks of 15 or more at some places. Though a rare occurrence as many as 20 buzzards can been spotted in one field area, approx 30 meters apart, so cannot be classed as a flock in the general term, consisting of those males (& females) without a mate or territory. They are fiercely territorial, and, though rare, fights do break out if one strays on another pair's territory, but dominant displays of aggression will normally see off the interloper. Pairs mate for life. To attract a mate (or impress his existing mate) the male performs a ritual aerial display before the beginning of Spring. This spectacular display is known as 'the roller coaster'. He will rise high up in the sky, to turn and plummet downward, in a spiral, twisting and turning as he comes down. To then rise immediately upward to repeat the exercise.
This broad-winged raptor has a wide variety of plumages, and in Europe can be confused with the similar Rough-legged Buzzard (Buteo lagopus) and the only distantly related Honey Buzzard (Pernis apivorus), which mimics the Common Buzzard's plumage for a degree of protection from Goshawks. The plumage can vary in Britain from almost pure white to black, but is usually shades of brown, with a pale 'necklace' of feathers.
The call is a plaintive peea-ay, similar to a cat's meow.
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Systematics
This species was first described by Linnaeus in his Systema naturae in 1758 as Falco buteo.2
Buzzard subspecies fall into two groups
The western buteo group are mainly resident or short-distance migrants. They are:
- Buteo buteo buteo: most of Europe
- B. b. rothschildi: Azores
- B. b. insularum: Canary Islands
- B. b. arrigonii: Corsica and Sardinia
- B. b. menetriesi: Caucasus
- B. b. harterti: Madeira, doubtfully distinct from nominate buteo
The eastern vulpinus group includes
- B. b. vulpinus (Steppe Buzzard): Eurasia: migrant breeder
- B. b. japonicus: Japan: resident
- B. b. trizonatus (Forest Buzzard): South Africa: resident
Two resident forms of islands close to Africa are often assigned to the first group, but appear to be distinct species more closely related to the African Long-legged Buzzard, based on biogeography and preliminary mtDNA cytochrome b sequence data (Clouet & Wink 2000):
- Buteo (buteo) bannermani (Cape Verde Buzzard): Cape Verde Islands
- Buteo (buteo) socotrae (Socotra Buzzard): Socotra
Steppe Buzzard
The Steppe Buzzard, B. (b.) vulpinus breeds from eastern Europe eastward to the Far East, excluding Japan. It is a long-distance migrant, excepting some north Himalayan birds, and winters in Africa, India and south eastern Asia. In the open country favoured on the wintering grounds, Steppe Buzzards are often seen perched on roadside telephone poles.
Steppe Buzzard is some times split as a separate species, B. vulpinus. Compared to the nominate form, Steppe Buzzard is slightly smaller (45-50 cm long), longer winged and longer tailed. There are two colour morphs; the rufous form which gives this subspecies its scientific name (vulpes is Latin for "fox"), and a dark grey form.
The tail of vulpinus is paler than the nominate form, and often quite rufous, recalling North American Red-tailed Hawk. The upperwings have pale primary patches, and the primary flight feathers are also paler when viewed from below. Adults have a black trailing edge to the wings, and both morphs often have plain underparts, lacking the breast band frequently seen in B. b. buteo.
Forest Buzzard
The Forest Buzzard, B. (b.) trizonatus, is another form sometimes upgraded to a full species. This is a resident breeding species in woodlands in southern and eastern South Africa.
It is very similar to the abundant summer migrant Steppe Buzzard, but the adult can be distinguished with a good view by its whiter underparts and unbarred flanks. The Juvenile differs from the same-age Steppe Buzzard by its white front and tear-shaped flank streaks.
Forest Buzzard, as its name implies, is a species of evergreen woodlands including introduced eucalyptus and pines, whereas Steppe Buzzard prefers more open habitats. However, habitat alone is not a good indicator for these forms.
References
- ^ BirdLife International (2004). Buteo buteo. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 11 May 2006. Database entry includes justification for why this species is of least concern |
- ^ (Latin) Linnaeus, C (1758). Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata., Holmiae. (Laurentii Salvii).. pp. 90. "F. cera pedibusque luteis, corpore fusco, abdomine paludo maculis fuscis.".
- Clouet, Michel & Wink, Michael (2000): The Buzzards of Cape Verde (Buteo (buteo) bannermani) and Socotra (Buteo buteo spp.) - First results of a genetic analysis based on nucleotide sequences of the cytochrome b gene. Alauda 68(1): 55-58. PDF fultlext
- Ferguson-Lees, Christie, Franklin, Mead and Burton Raptors of the World ISBN 0713680261
- Mullarney, Svensson, Zetterstrom and Grant, Collins Bird Guide ISBN 0-00-219728-6
- Ian Sinclair, Phil Hockey and Warwick Tarboton, SASOL Birds of Southern Africa (Struik 2002) ISBN 1-86872-721-1
External links
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Wikimedia Commons has media related to: Buteo buteo |
- Madeira Birds: Buzzard. Page about the controversial subspecies harterti. Retrieved 2006-NOV-28.
- Ageing and sexing (PDF) by Javier Blasco-Zumeta
Wikipedia content modification information:
- This page was last modified on 19 October 2008, at 09:45.
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