Hawk Owl

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Hawk Owl

 

(Surnia ulula), a bird of the order Strigiformes. The body length is 36–41 cm, and the weight, 250–360 g. The females are larger than the males. The head is relatively small, and the facial disk is incomplete. The wings are long and pointed, the long tail is sharply graduated, and the tarsometatarsi and toes are densely feathered. The plumage is brown, with white spots on the upper parts; the underparts are light, with dark transverse stripes, as in hawks (hence the name). The bill is yellow.

The hawk owl is distributed in northern Europe, Asia, and North America. In the USSR it is found in the forest zone as far east as Kamchatka and Sakhalin and in the spruce forests of the Tien-Shan. It is either sedentary, or it wanders in the winter. It inhabits tall-trunked forests. It nests in tree hollows or on the tops of broken trunks, or it occupies the nests of other birds. The clutch usually contains three or four eggs, and in years when food is abundant it contains as many as seven to nine. The hawk owl hunts in the morning and the evening for rodents, more rarely for birds.

References in periodicals archive ?
Reproductive biology of Hawk Owls in Denali National Park, Alaska.
Observations of Northern Hawk Owls nesting in Roseau County.
Observations on nesting Hawk Owls at the Mer Bleue, near Ottawa, Canada.
ABSTRACT--In 1994, Steve Gniadek (SJG) located a Northern Hawk Owl (Surnia uhila) nest in Glacier National Park (GNP), Montana.
Key words: diet, Glacier National Park, management, Montana, nesting, Northern Hawk Owl, prey caching, prey plucking, status, Surnia ulula
The Northern Hawk Owl (Surnia ulula) is patchily distributed across the boreal forests of northern Eurasia and North America (Duncan and Duncan 2014).
Prior to March 1994, GNP files contained only 4 sight records of the Northern Hawk Owl: 1 questionable report from August 1989; 2 in 1991 (January and September); and 1 in January 1994.
Plucking of dead prey by the Northern Hawk Owl has previously been described by Kertel (1986), Nero (1995), and Duncan and Duncan (2014).
The Northern Hawk Owl is an irruptive species believed to temporarily extend its breeding range south in response to environmental change, such as fire and food availability (Duncan and Duncan 2014).
The Northern Hawk Owl was considered a rare species in Montana (Wright 1996), but after many records it was removed from the rare bird list in 2005 by the Montana Bird Records Committee.
Apparent short-term storage of food by Hawk Owl. Var Fagelvarld 43:495.
Great Gray Owl and Northern Hawk Owl nests at Churchill, Manitoba.