There are some distinct characteristics of its appearance. The wingspan can exceed 152 cm (5 ft 0 in), but averages 142 cm (4 ft 8 in) for females and 140 cm (4 ft 7 in) for males. It also looks like it has a black bow tie. 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.. In northeastern North America, the owls are found year-round in southern Quebec and Ontario, but individuals will sometimes move further south in winter into New York and New England, apparently in pursuit of more abundant prey. In mated pairs, the male is the primary hunter who provides food for the entire family while the female guards and broods the eggs, nestlings, and flightless fledglings. 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. Lynch, Wayne. The great grey owl is the provincial bird of Manitoba. Immediately after fledging, the white, fuzzy young must use beak and feet to climb back into trees. Two live at Blue Mountain Wildlife near Pendleton, Oregon, a third lives at Lindsay Museum in Walnut Creek, California, and the fourth lives at CuriOdyssey in San Mateo, California. The call of the adult is a series of very deep, rhythmic whoos, which is usually given in correlation to their territories or in interactions with their offspring. This owl does not have ear tufts and has the largest facial disc of any raptor. Livestock grazing in meadows also adversely affects great grey owls, by reducing habitat for preferred prey species..  Much of its size is deceptive, since this species' fluffy feathers, large head and the longest tail of any extant owl obscure a body lighter than that of most other large owls. West Nile Virus is likely to become more prevalent with climate change. Great grey owls do not build nests, so they typically use nests previously used by a large bird, such as a raptor. 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. They also feature areas of white that are on the side areas of the eyes. Also, great grey owls may not nest in years of drought. In dry parts of California's Sierra Nevada they eat mostly pocket gophers. These include differences in migration patterns, prey preference, and nest site selection. Two pale arcs form an “X” between the eyes. They are also found around farm land but that is mainly when they are enroute to their migration location. The great grey owl or great gray owl (Strix nebulosa) is a very large owl, documented as the world's largest species of owl by length. As of 2016, there are four captive great grey owls in Oregon and California. Its bill and eyes yellow. Along the Sierra Mountain range of California that has recently been a number of Great Grey Owls located. Locally, alternative prey animals (usually comprising less than 20% of prey intake) include hares, moles, shrews, weasels, thrushes, grouse, Canada jays, mountain quail, small hawks and ducks. Boris was found north of Anchorage with a trauma to his right wrist, leaving him flightless.. There are approximately 100 of the now but they aren’t native to this area. It helps to keep the population under control when basic needs can’t be met. For example it looks like it has a white moustache. As the owlets matured and began flying they came for the prey on their own. The great grey owl is not as aggressive as most other alpha predators.  The males are usually smaller than females, as with most owl species.. Unlike, for example, osprey or white storks, the great grey owl does not predictably re-use nest sites over consecutive years. While this is a great balance by nature it also means it is hard to get the number of these owls to increase. The abundance of food in the area usually affects the number of eggs a female lays, a feature quite common in northern owl species. Retrieved 26 November 2013. What species they eat depends on which small mammals are most abundant and available. There are two recognized subspecies of the great grey owl spread across North America and Eurasia.. It is distributed across the Northern Hemisphere, and it is the only species in the genus Strix found in both Eastern and Western Hemispheres. In addition breeding has been confirmed in the Tahoe National Forest east of Nevada City; in the Sierra Nevada foothills south of I-80 at around 2,000 feet (610 m) elevation; and for the population clustered around Yosemite. It is very rare that you will hear vocalizations from the Great Grey Owl. In some areas it is also called Phantom of the North, cinereous owl, spectral owl, Lapland owl, spruce owl, bearded owl, and sooty owl..
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