A big grey owl with yellow eyes, the great grey owl has a 135-160 cm wingspan and a body length of nearly 70 cm. It is grey and has a proportionally large and round head. On the face you can see fine grey rings around small yellow eyes and a yellowish beak. It eats mostly small rodents. They like to fly low through open areas in search of their prey, such as a clearing in the forest, power line openings and meadows where they have a good view.
Great grey owls live in pairs and the female incubates a litter of 2-6 eggs alone. After 2 months of age the young are ready to fly. These owls don’t build their own nests, but usually take over nests from other birds of prey.
In recent decades, an increasing part of the known breeding, have been carried out in nests made voluntarily by people. In many cases these nests have replaced the natural twig nests and nesting tree stumps destroyed by logging.