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• Timber harvest is a threat when it removes the large live and dead trees required for nesting and the dense cover required for protecting new fledglings.
• Among other threats, ravens and GreatHorned Owls prey on eggs and nestlings.Great Grey Owls are semi-nomadic, with irregular site or mate fidelity between years.
• Testing of owls in the Yosemite area since 2005 has found evidence of the virus in that population.
• The Eurasian subspecies of the grey owl is very commonly kept in European zoos.
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• In winter 2017, the birds were recorded in northern New York in Robert Moses State Park and central Maine.

Make DOC and DOCX files easy to read by converting them to PDF. The Cornell Lab will send you updates about birds, birding, and opportunities to help bird conservation. Explore birds based on location and time of year. Get a customized list of birds from anywhere in the U.S. or Canada. Because Great Gray Owls are highly sought-after by birders and photographers who want to see the birds, and are sensitive to disturbance, don’t use call playbacks to find them. You can also use the eBird species maps tool to find areas where other birders reported them in the past to try your luck at finding one.

Great Gray Owl

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• Northern Goshawks arevery common providers of nest sites for Great Grey Owls.
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• You can also use the eBird species maps tool to find areas where other birders reported them in the past to try your luck at finding one.
• Strix nebulosa belongs to the family, Strigidae, along with its close cousins, the barred owl (Strix varia) and spotted owl (Strix occidentalis).

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As the owlets matured and began flying they came for the prey on their own. One alert landowner in northeast Oregon, Andy Huber, helped a female great grey owl raise her four nestlings after a great horned owl killed the male. If food is scarce, they may travel a fair distance to find more prey, with considerable movements by large numbers in some years of particularly scarce prey.

Range

Convert PSD files into professional-grade PDF documents, ideal for sharing and printing. Using mice to bait or lure in owls (of any species) should be avoided all together. Among other threats, ravens and GreatHorned Owls prey on eggs and nestlings.Great Grey Owls are semi-nomadic, with irregular site or mate fidelity between years.

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In Yosemite is where the first nest south of Canada was found in 1914. A 2015 study in California estimated there were fewer than 300 birds in the state at the time. In Oregon, the great grey owl breeding range is scattered from the Siskiyou Mountains in the southwest to the Blue Mountains in the northeast. Even though the species occurs in Europe, the first great grey owl recognized by science was found in Canada in the late 18th century.
In years when small mammal populations are very low the great grey owl may not attempt nesting; thus their reproduction is connected to the sometimes extreme fluctuations of small mammal populations. Brooding lasts 2 to 3 weeks, after which the female starts roosting on a tree near nests. A study of the Yosemite owls shows that this population has been genetically isolated from populations in Oregon and farther north for more than 25,000 years.

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In northern Canada and other parts of Scandinavia, they eat lemmings primarily. What species they eat depends on which small mammals are most abundant and available. They then can crash to a snow depth roughly equal to their own body size to grab their prey. 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. On the nesting grounds, they mainly hunt at night and near dawn and dusk; at other times, they are active mostly during the night. Huber live-trapped small mammals and then released them at the nest site, and the female took these to the nestlings.

Living in the Nearctic biogeographic province, the northern part of the New World. The owl has a distinctive facial disk, with two obvious gray concentric circles. You'll find plans for building a nest structure of the appropriate size on our All About Birdhouses site.