citation needed The great grey is outweighed by those two species as well as several others, including most of the genus Bubo. In terms of length, the great grey owl is believed to exceed the Eurasian eagle-owl and Blakiston's fish owl as the world's largest owl. This owl does not have ear tufts and has the largest facial disc of any raptor. In some areas it is also called the Phantom of the North, cinereous owl (this name is also used for Strix sartorii), spectral owl, Lapland owl, spruce owl, bearded owl, and sooty owl.
Only a handful of great grey owl nests have ever been found in Washington state. In Washington state, great grey owls are found in the southeast where mountains extend up from Oregon and in the Colville National Forest. In winter these birds do not move far but may go downslope to escape deep snow as they must capture their prey on the ground.
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This tall gray owl, patterned with brown and white mottling, streaks, and barring, sports a large facial disk and yellow eyes. Strix nebulosa belongs to the family, Strigidae, along with its close cousins, the barred owl (Strix varia) and spotted owl (Strix occidentalis). Another captive wild injured great grey owl, Errol, lives at the Alaska Zoo in Anchorage, Alaska. A captive wild injured great grey owl, Boris, resides at unlimluck the Alaska Raptor Center in Sitka, Alaska. The great grey owl often remains still even if a human is nearby and therefore they are often overlooked or unnoticed.

• When threatened, a Great Grey Owl will snap its beak, spread its wings, and growl.
• In terms of length, the great grey owl is believed to exceed the Eurasian eagle-owl and Blakiston’s fish owl as the world’s largest owl.
• Great grey owls do not build nests, so they typically use nests previously used by a large bird, such as a raptor.
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• As with all owls, its eyes are immobile, aimed instead by extremely flexible head movements.
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Blending perfectly with the gray-brown bark of its conifer perch, the great gray owl becomes one with the forest. The Eurasian subspecies of the grey owl is very commonly kept in European zoos. As of 2016, there are four great grey owls captive in Oregon and California. As an exception, the female is aggressive in protecting eggs and owlets. They are less likely to attack each other or potential threats than are other large predatory birds. Testing of owls in the Yosemite area since 2005 has found evidence of the virus in that population.

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• Great gray owls primarily vocalize during the breeding season.
• Tame owls may produce higher-pitched hoots when given food by humans.

They breed in North America from as far east as Quebec to the Pacific coast and Alaska, and from Finland and Estonia across northern Asia. National Geographic recorded at least one as having lived to the age of forty, and the oldest recorded wild owl was around nineteen years. Once believed to require a cold climate, it is now known that this bird survives in a few areas where summer temperatures exceed 100 °F (38 °C).citation needed
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Other dangers to great grey owls include rodenticides, collisions with vehicles, and the West Nile Virus. If perches are not left in clearcuts, great grey owls cannot readily hunt in them. The harvest of timber from the great grey owl's habitat is, perhaps, the greatest threat to this species. Unlike the more versatile eagle and horned owls, great grey owls rely almost fully upon small rodents.

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They fly close to the ground, usually less than 6 metres up, except when flying to a nest. This Owl is the provincial bird emblem of Manitoba, Canada. The species name nebulosa is derived from the Latin Nebulosus, meaning misty or foggy. The Great Grey Owl is large grey owl with dense, fluffy plumage, long wings and tail, and a large head with no ear-tufts. 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.

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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. Males and females aggressively defend nests and have been knownto drive off predators as large as black bears. Unlike most otherOwls, nests are usually tidied up and refurbished before use. They also readily take toartificial platforms or nests placed in suitable habitat. Whenexcited near the nest adults growl, shriek, hoot, wail, andsnap their bills.

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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.

In winter 2017, the birds were recorded in northern New York in Robert Moses State Park and central Maine. Great grey owls are rarely sighted as far south as Pennsylvania and Long Island, New York. Farther east in the western United States, great grey owls breed in Idaho, Montana, and Wyoming, as far south as the Grand Teton and Yellowstone National Parks.

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In the stillness of a cold mountain meadow, this elusive giant quietly floats on broad wings across meadows and openings in evergreen forests. The Great Gray Owl is a dapper owl dressed in a gray suit with a bow tie across its neck and a surprised look on its face. Theyare also found in northern Europe and Asia.