Rough-legged buzzard

Rough-legged buzzard
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Falconiformes
(or Accipitriformes, q.v.)
Family: Accipitridae
Genus: Buteo
Species: B. lagopus
Binomial name
Buteo lagopus
(Pontoppidan, 1763)
Range of B. lagopus     Summer      Winter
The tail is white with a dark terminal band.
The feet are feathered.

The rough-legged buzzard (Buteo lagopus), also called the rough-legged hawk, is a medium-large bird of prey. It is found in Arctic and Subarctic regions of North America and Eurasia during the breeding season and migrates south for the winter.[2] It was traditionally also known as the rough-legged falcon[3] in such works as John James Audubon's The Birds of America.

Nests are typically located on cliffs, bluffs or in trees. Clutch sizes are variable with food availability but 3–5 eggs are usually laid.[4] These hawks hunt over open land, feeding primarily on small mammals.[2] Along with the kestrels, kites and osprey, this is one of the few birds of prey to hover regularly.[5]

Description

This fairly large raptorial species is 46–60 cm (18–24 in) with wingspan ranging from 120 to 153 cm (47 to 60 in).[2][6] Individuals can weigh from 600 to 1,660 g (1.32 to 3.66 lb) with females typically being larger and heavier than males.[7][8] Weights appear to increase from summer to winter in adults, going from an average of 822 to 1,027 g (1.812 to 2.264 lb) in males and from 1,080 to 1,278 g (2.381 to 2.818 lb) in females.[9][10] Among the members of the Buteo genus, it is sixth heaviest, the fifth longest, and the fourth longest winged.[11] Among standard measurements in adults, the wing chord is 37.2–48.3 cm (14.6–19.0 in), the tail is 18.6–25.5 cm (7.3–10.0 in), culmen is 3.2–4.5 cm (1.3–1.8 in) and the tarsus is 5.8–7.8 cm (2.3–3.1 in).[11][12][13] The plumage is predominantly brown in colour and often shows a high degree of speckling.[2] A broad brown chestband is present in most plumages and a square dark carpal patch contrasting with the white under-wing is an easily identifiable characteristic in light morph individuals.[2] A wide variety of plumage patterns are exhibited in light vs. dark morphs, males vs. females and adults vs. juveniles. Extensive field experience is required to distinguish between certain plumage variations.[9] Compared to its more common nearctic and palearctic cousins, the common buzzard (Buteo buteo) and the red-tailed hawk (Buteo jamaicensis), it is slightly larger, though may be outweighed by the latter.

Its feet are feathered to the toes as an adaptation to its arctic home range. Its scientific name, Lagopus, is derived from Ancient Greek lago (λαγως), meaning "hare", and pous (πους), meaning "foot".[14] Its talons are relatively small, reflecting their preferred choice of prey.

Distinguishing characteristics in all plumages include long white tail feathers with one or more dark subterminal bands. The wing tips are long enough to reach or extend past the tail when the animal is perched.[2] The common buzzard can be similar-looking, with a similar long-tailed shape and can be notoriously variable in plumage. The rough-legged is longer-winged and more eagle-like in appearance. The red-tailed hawk is chunkier-looking and differs in its darker head, broader, shorter wings, barring on the wings and the tail, dark leading edge to the wings (rather than black wrist patch) and has no white base to the tail. The ferruginous hawk is larger, with a bigger, more prominent bill and has a whitish comma at the wrist and all-pale tail.[15]

It is the only hawk of its size (other than the very different-looking Osprey) to regularly hover over one spot, by beating its wings quickly.

Rough-legged buzzard in flight at the Seedskadee National Wildlife Refuge (Wyoming)

Taxonomy

The rough-legged hawk is a member of the genus Buteo, a group of moderately large raptors exhibiting broad wings, short tails and wide robust bodies.[2][16] This group is known as hawks in North America but referred to as buzzards in Europe.[2]

There are at least 3 recognized subspecies of Buteo lagopus:

Habitat and distribution

The rough-legged hawk breeds in tundra and taiga habitats of North America and Eurasia between the latitudes of 61° and 76° N. Rough-legged hawks occurring in North America migrate to southern Canada and into the central United States for the winter, while Eurasian individuals migrate to southern Europe and Asia. It is the only member of its diverse genus found in both of the Northern continents and has a complete circumpolar distribution. During these winter months, from November to March, preferred habitats include marshes, prairies and agricultural regions where rodent prey is most abundant.[2]

Breeding sites are usually located in areas with plenty of unforested, open ground.[4] Depending on snow conditions, migrants arrive at breeding grounds during April and May.[2] Home ranges vary with food supply but are commonly reported to be 10–15 km2 (3.9–5.8 sq mi) during the winter, but little is known about home ranges during the breeding season.[4] Although frequently attacked in skirmishes by other highly territorial birds such as gyrfalcons and skuas, the rough-legged buzzard is not strongly territorial.[2] However, wintering rough-legged buzzards seems to behave aggressively towards common buzzards in Sweden and both species with try to keep the other off a fixed hunting range.[17]

Behavior

Diet

This species is carnivorous, typically feeding on small mammals, which make up 62–98% of its diet. Lemmings and voles are the major prey items of this species, seasonally comprising up to 80–90% of their prey, but this varies with seasonal availability.[2][11][18] Some evidence suggests that these hawks may be able to see vole scent marks which are only visible in the ultraviolet range, allowing them to cue in on prey.[19] The rough-legged hawk will also supplement its diet with mice, rats, gerbils, pikas and insects.[2][18] Besides mammals, birds are the second most favored type of prey for rough-legs. Most avian prey species are small passerines such as snow buntings (Plectrophenax nivalis), Lapland longspur (Calcarius lapponicus) and American tree sparrow (Spizelloides arborea). However, they will also prey on birds slightly larger than the passerines typically targeted, especially ptarmigan (Lagopus ssp.), as well as waterfowl, shorebirds (such as ruffs (Philomachus pugnax)) and short-eared owls (Asio flammeus). They usually target bird prey which are young and inexperienced, with relatively large avian prey often being snatched in their fledging stage.[11] When small mammals are scarce, the rough-legged hawk will also feed on larger, medium-sized mammals including prairie dogs (Cynomys ssp.), ground squirrels, muskrats (Ondatra zibethicus), weasels (Mustela ssp.) and even adult black-tailed jackrabbits (Lepus californicus) of approximately twice their own weight.[20][21] During winter, shrub-steppe habitats seem to encourage a strong dependence on rabbit prey.[2] In developed areas of England, wintering rough-legged buzzards have been recorded preying most regularly on relatively large prey such as common wood pigeon (Columba palumbus) and invasive European rabbits (Oryctolagus cuniculus).[11]

This avian predator hunts opportunistically, occasionally supplementing their diet with carrion, but focusing primarily on the most locally abundant small vertebrates. Rough-legged hawks will steal prey from other individuals of the same species as well as other species such as the red-tailed hawk, hen harrier (Circus cyaenus), American kestrel (Falco sparverius) and common raven (Corvus corax).[22] Prey sizes typically range from 6.5–2,587 g (0.23–91.25 oz) and adults require 80–120 g (2.8–4.2 oz) of food daily, around the body mass of the largest species of vole or lemming although most species weigh a bit less.[11] These raptors hunt during the daytime.[11] Like most Buteos, rough-legged buzzards have been reported both still-hunting (watching for prey from a perch and then stooping) and watching for prey while in flight. Unlike most other large raptors, they may engage in hovering flight above the ground while search for prey.[2]

Reproduction

Egg, Collection Museum Wiesbaden

Sexual maturity is reached at about two years old. Breeding generally occurs during May but is variable depending upon dates of arrival at breeding grounds. The rough-legged hawk is thought to be monogamous, mating with a single individual for multiple years.[2] No evidence currently suggest otherwise.

Nests are built soon after arrival to breeding grounds and require 3–4 weeks to complete. Twigs, sedges and old feathers are used as building materials. Nests are 60–90 cm (24–35 in) in diameter and 25–60 cm (9.8–23.6 in) in height.[2] Cliff ledges and rocky outcroppings are preferred nesting sites. Females can lay 1–7 eggs but will typically lay 3–5.[2][4] Average egg size is 56.4 mm (2.22 in) in length by 44.7 mm (1.76 in) in width. Minimum incubation period is 31 days, provided almost exclusively by the female. The male feeds the female during this incubation period. After hatching, young require 4–6 weeks before fledging the nest. Fledglings depend on parents to provide food for 2–4 weeks after leaving the nest.[2]

Longevity and mortality

Rough-legged buzzards that survive to adulthood can live to an age of 19 years in the wild. One female being kept in an Idaho zoo is over 25 years of age and there is a female that is a minimum of 38 years old living in Redding, Ca as of 2015. However, perhaps a majority of individuals in the wild do not survive past their first two years of life. The threats faced by young rough-legs can include starvation when prey is not numerous, freezing when Northern climes are particularly harsh during brooding, destruction by humans, and predation by various animals. The chances of survival increase incrementally both when they reach the fledging stage and when they can start hunting for themselves. Death of flying immatures and adults are often the result of human activity, including collisions with powerlines, buildings and vehicles, incidental ingestion of poison or lead from prey or illegal hunting and trapping.[23]

Most predation recorded on this species is on the young at the nest. Arctic foxes (Vulpes lagopus), brown bears (Ursus arctos) and wolverines (Gulo gulo) have all eaten eggs and young of this species if they are capable of accessing nests on foot.[24] Avian scavengers, especially maurading groups of common ravens, will also readily predate eggs and nestlings, as will skuas (Stercorarius ssp.). Snowy owls (Bubo scandiacus) are a potential predator at the nest as well.[25] Adults, being a large raptorial bird, have fewer natural predators but may die in conflicts, especially if they are defending their own nests and are occasionally predated by other large raptorial birds. Raptors who prey on rough-legged buzzards of most ages at varied times of year may include numerous eagles (especially the golden eagle (Aquila chrysaetos), though also sometimes other Aquila in Eurasia and seldomly Haliaeetus eagles) as well as large falcons. While wintering, rough-legged buzzards or hawks may be vulnerable to predation by night to Eurasian eagle-owls (Bubo bubo) or great horned owls (Bubo virginianus) and rarely, during day, other large Buteo hawks, including those of their own species.[2][23][26]

Vocalization

Adult rough-legged hawks will vocalize alarm calls when intruders approach a nesting site. It is described as a downward slurring whistle, sounding like kiu wiyuk or a lengthy descending kee-eer similar to that of the red-tailed hawk. This cry is given in flight or from a perch every 15–30 seconds. During courtship, both sexes have been recorded to give a whistling sound that changes to a hiss. Following copulation, females will give a clucklike sound and males vocalize a whistling noise. Fledglings will give begging calls while waiting for parents to provide food.[2]

References

  1. ↑ BirdLife International (2013). "Buteo lagopus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Bechard, M.J.; Swem, T.R. (2002). Poole, A.; Gill, F., eds. Rough-legged Hawk (Buteo lagopus). The Birds of North America (Philadelphia, PA: The Birds of North America, Inc.).
  3. ↑ Richardson, J.; Swainson, W.; Kirby, W. (1831). Fauna Boreali-americana, Or, The Zoology of the Northern Parts of British America: The birds. London: John Murray.
  4. 1 2 3 4 "Rough-legged Hawk". Virtual Wildlife. Lethbridge College. Retrieved 18 December 2011. External link in |website= (help)
  5. ↑ "Birds of Prey". birdofpreytrail.com. Archived from the original on 28 October 2012. Retrieved 18 December 2011. External link in |website= (help)
  6. ↑ Porter, R.F. (1990). Flight Identification of European Raptors (Third ed.). Academic Press. ISBN 978-0-85661-027-1.
  7. ↑ Dunning, John B., Jr., ed. (1992). CRC Handbook of Avian Body Masses. CRC Press. ISBN 978-0-8493-4258-5.
  8. ↑ del Hoyo, J.; Elliot, A.; Sargatal, eds. (1996). Handbook of the Birds of the World 3. Barcelona: Lynx Edicions. ISBN 84-87334-20-2.
  9. 1 2 Brown, L.; Amadon, D. (1968). Eagles, hawks and falcons of the world. Vol. 2. New York: McGraw-Hill.
  10. ↑ Snyder, N.F.R.; Wiley, J.W. (1976). "Sexual size dimorphism in hawks and owls of North America". Ornithology Monograph (The American Ornithologists' Union) (Number 20): i–96. doi:10.2307/40166710.
  11. 1 2 3 4 5 6 7 8 Ferguson-Lees, J.; Christie, D. (2001). Raptors of the World. London: Christopher Helm. ISBN 0-7136-8026-1.
  12. ↑ Cade, Tom J. (1955). "Variation of the Common Rough-Legged Hawk in North America" (PDF). The Condor 57 (6): 313–346. doi:10.2307/1364791. JSTOR 1364791.
  13. ↑ Friedmann, H. (1950). "The birds of Middle and North America". U.S. National Museum Bulletin (50).
  14. ↑ Audet, Alexandra M.; Robbins, C. Brian; Larivière, Serge (26 December 2002). "Alopex lagopus – Remarks" (PDF). Mammalian Species (Northampton, MA: Smith College) 713: 5. doi:10.1644/1545-1410(2002)713<0001:al>2.0.co;2. Retrieved 4 June 2011.
  15. ↑ "Rough-legged Hawk". All About Birds. Cornell Lab of Ornithology. Retrieved 22 August 2012.
  16. ↑ "Hawks – Genus Buteo – Introduction". Oiseaux-birds.com. Retrieved 18 December 2011. External link in |website= (help)
  17. ↑ Sylvén, M. (1978). "Interspecific relations between sympatrically wintering Common Buzzards Buteo buteo and Rough-legged Buzzards Buteo lagopus". Ornis Scandinavica 9: 197–205. doi:10.2307/3675882. JSTOR 3675882.
  18. 1 2 Springer, A.M. (1975). "Observations on the summer diet of Rough-legged Hawks from Alaska" (PDF). Condor 77 (3): 338–339. doi:10.2307/1366233.
  19. ↑ Koivula, M.; Viitala, J. (1999). "Rough-legged Buzzards use vole scent marks to assess hunting areas". Journal of Avian Biology 30 (3): 329–332. doi:10.2307/3677362. JSTOR 3677362.
  20. ↑ Weller, M.W. (1964). "Habitat utilization of two species of buteos wintering in central Iowa" (PDF). Iowa Bird Life 34: 58–62.
  21. ↑ Korpimäki, E.; Norrdahl, K. (1989). "Avian predation on mustelids in Europe 1: occurrence and effects on body size variation and life traits". Oikos 55: 205–215. doi:10.2307/3565424. JSTOR 3565424.
  22. ↑ Temeles, E.J.; Wellicome, T.I. (1992). "Weather-dependent kleptoparasitism and aggression in a raptor guild". Auk 109: 920–923. doi:10.2307/4088176.
  23. 1 2 Good, G. (2008). "Buteo lagopus". Animal Diversity Web. External link in |website= (help)
  24. ↑ Swem, T.R. (1996). Aspects of the breeding biology of Rough-legged Hawks along the Colville River, Alaska (Master's Thesis). Boise, ID: Boise State University.
  25. ↑ Dement'ev, G.P.; Gladkov, N.A. (1951). Birds of the Soviet Union. Vol. 1. Moscow, USSR: Publishing House Sovetskaya Nauka. [English translation by the Israel Program for Scientific Translations, Jerusalem, Israel, in 1966.]
  26. ↑ White, C.M.; Cade, T.J. (1971). "Cliff-nesting raptors and ravens along the Colville River in arctic Alaska". Living Bird (Cornell Laboratory of Ornithology) 10: 107–150.

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