Great Grey Owl | ©K. Koontz (Parkland, Minnesota, US)
The Great Grey Owl, Strix nebulosa (Strigidae) is the tallest owl, standing at a length 24-33 inches high, with a wing span of 54-60 inches, depending on degree of maturity.
Strix nebulosa is larger and grayer than other owls and its round head does not have any ear tufts. Its bill and eyes are yellow .
This species breed in North America from as far east as Quebec to the Pacific coast and Alaska, and from Finland and Estonia across northern Asia. 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 and is listed Endangered under California’s Endangered Species Act .