The collared sparrowhawk (Accipiter cirrocephalus) is a small, slim bird of prey in the family Accipitridae found in Australia, New Guinea and nearby smaller islands. As its name implies the collared sparrowhawk is a specialist in hunting small birds. It is characterised by its slight brow ridges and slender feet. The last segment of their middle toe projects beyond the claws of the other toes.
The collared sparrowhawk is 29–38 cm (tail about half ), with a wingspan 55–78 cm, the average male weighs 126g, female 218g. They are small, fierce, finely built with rounded wings, long square tail, yellow eyes and long legs. Adults have slate-grey upper parts, sometimes with a brown wash, and a chestnut half collar. The underparts are finely barred rufous and white. The under wing and tail are finely barred. The cere is cream to olive-yellow, the eyes yellow and the legs and feet yellow. The sexes are similar in appearance but males are smaller than females. Juveniles have brown upper parts, with pale streaks on the head and nape, and fine rufous edges to the feathers of the back and wings. The under parts are white with heavy brown streaks on the breast and coarse brown barring on the belly. The underwings and tail are finely barred. The cere is cream to greenish yellow, the eyes brown to pale yellow and legs and feet pale yellow.
Distribution and habitat
The collared sparrowhawk is widespread through mainland Australia, Tasmania and New Guinea and is found in all habitats except the driest deserts. It can occasionally be seen in urban areas and even cities. Although widespread, they are generally uncommon. collared sparrowhawks are generally resident but may be partly migratory, however their movements are poorly known.
The collared sparrowhawk mainly eats small birds, the crested pigeon and spotted bowerbird are the largest birds that sparrowhawks have been recorded taking. They also catch insects, lizards and small mammals (including small bats). Sparrowhawks rely on stealth and surprise to catch their prey, hunting in flight or bursting from a concealed perch among foliage. Most prey weighs less than 100g and rarely over 200g. It forages by short-stay perch hunting from a concealed position in foliage, punctuated by short tree-to-tree, often undulating flights. It also forages by low fast flight, sometimes hedge hopping. Prey is seized in flight by a direct flying attack or a stealthy glide.
The laying season is July to December. Pairs nest solitarily. The nest is a platform of sticks 27–32 cm across, 12–15 cm deep, lined with green leaves around 4-39m above ground in the fork of a living tree. The clutch size is usually three or four eggs, ranging from two to five. Incubation takes 35 days, and the nesting period is about 28–33 days. The period of dependence after fledging lasts up to 6 weeks, after which young disperse. Sexual maturity is reached at one year, with birds sometimes breeding in juvenile plumage.
Threats and conservation
The collared sparrowhawk is not globally or nationally threatened. It is widespread and generally uncommon, but may be common in forests in the tropics and subtropics; it is also secretive and most likely under-recorded. It has undergone declines in extensively cleared areas. It is thought that their loss of numbers is due to the use of DDT which has reduced the thickness of collared sparrowhawks' eggs by 2%, and the increase of the pied currawong (Strepera graculina) a predator and competitor capable of robbing and injuring adults and killing nestlings.
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- Luke D.Einoder and Alastair M.M. Richardson. (2007). Aspects of the hindlimb morphology of some Australian birds of prey: a comparative and quantitative study.Hobart:The Auk 124(3):773-788.
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- Olsen,p.(1993).Pesticide-related Eggshell Thinning in Australian Raptors: Emu 93(1) 1 - 11.
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