The Great Grey Owl or Lapland Owl (Strix nebulosa)looks like a very large Owl but they are deceptively small and weighs less than a Common Buzzard, they are usually found across the Northern Hemisphere.
Adults have a big, rounded head with a grey face and yellow eyes with darker circles around them. The underparts are light with dark streaks; the upper parts are grey with pale bars. This owl does not have ear tufts and has the largest "facial disc" of any raptor.

They breed in North America from Lake Superior to the Pacific coast and Alaska, and from Scandinavia across northern Asia. They are permanent residents, but may move south and southeast when food is scarce. A small population, estimated at less than 100 birds, occurs in the Sierra Nevada mountains of California. This population is the southernmost population of the species' range.
These birds wait, listen and watch for prey, then swoop down; they also may fly low through open areas in search of prey.

Their large facial disks focus sound, and the asymmetrical placement of their ears assists them in locating prey. On the nesting grounds, they mainly hunt at night and near dawn and dusk; at other times, they are active mostly during the night. They have excellent hearing, and may capture prey moving beneath 60 cm (2 feet) of snow in a series of tunnels.