Most owls respond to their own species calls if played back in a nesting territory. Livestock grazing in meadows also adversely affects great grey owls, by reducing habitat for preferred prey species. Only this species and, more infrequently, other fairly large owls from the genus Strix are known to "snow-plunge" for prey, a habit that is thought to require superb hearing not possessed by all types of owls. Convert RAW image files into high-quality PDF documents for free.
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While globally secure, they are a state sensitive species in Oregon and endangered in California. After hatching a month later, the young will stay in the nest for 3 to 4 weeks until leaving it, still unable to fly. As they grow, their food begging becomes a loud shriek. They attack with a short or hovering flight over the opening, pouncing feet first towards their prey through the snow. In the Pacific Northwest, pine, oak/madrone, Douglas-fir and other forest types bordering bogs, fields, or meadows are suitable. Though taller and appearing larger than the great horned owl (Bubo virginianus) due to its fluffy plumage, it actually weighs less.
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This lack of territorial aggressiveness makes the great grey owl difficult to find in the field. She is especially alert and aggressive when fledglings first leave the nest but cannot yet fly, and thus are extremely vulnerable. They do not protect a large nesting territory, nor do they defend hunting territories through aggression. The great grey owl is not as aggressive as most other apex predators. In Ontario and northeastern Oregon there are confirmed great grey owl deaths from the virus.
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- The Great Gray Owl is an elusive bird that is not easy to find, despite its size.
- The erection of nest platforms for great grey owls was pioneered by Robert Nero in central Canada in the 1970s.
- Theytend to settle and nest in areas with high food resources and this may lead them to occupythe same nest for several years or move off to new areas.
- Several sites are inspected beforeshe chooses the nest site.
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Normally the male hunts for his mate and the young throughout the nesting period. The young jump or fall from the nest at 3 to 4 weeks, and start to fly 1 to 2 weeks after this. They will also nest in broken-topped trees and cavities in large trees.
- In southwestern and northeastern Oregon, the great grey owl has been using man-made platforms for nest sites since the 1980s.
- The male selectspossible nest sites and attracts its mate with calls.
- They have excellent hearing, and may locate (and then capture) prey moving beneath 60 cm (2.0 ft) of snow in a series of tunnels solely with that sense.
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They are permanent residents, although northerly populations may move south and southeast when food is scarce. In the wild, great grey owls have been recorded to live between ten and twenty unlimluck years with the average being seven. In Oregon and California this owl has been found nesting in mixed oak woodlands.
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Biologists working on that study suggest that the Yosemite population should be considered a separate sub-species (Strix nebulosa yosemitensis). The species is listed as Endangered under the California Endangered Species Act.full citation needed The California range for the species includes a small extension of the Oregon population, north of Alturas. The great grey owl in this region is found in disjunct areas of appropriate habitat.
The female tears food into small pieces and feeds the young. The female does all incubation and the male provides all food to the female andyoung. 2 to 5 (average 3) eggs are laid, eachseparated by 1 to 2 days. Nests are usually in a forest,but with a large clearing or meadow located within 1.3km. Northern Goshawks arevery common providers of nest sites for Great Grey Owls. Several sites are inspected beforeshe chooses the nest site.
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Your best chance of seeing one is during an irruptive year when it comes south in search of food. Populations may move well south of their normal range in years when prey, especially voles, are particularly abundant there. In farnorth America, they frequent stunted coniferous forests along the edge of the Arctictreeline, through spruce and tamarack muskeg forests further south. This leads tohigher than expected densities, for a large bird of prey.
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