The great grey owl (Strix nebulosa) (also great gray owl in American English) is a true owl, and is the world's largest species of owl by length. It is distributed across the Northern Hemisphere and is the only species in the genus Strix found in both Eastern and Western Hemispheres.
Source: Wikipedia
Other members of the owls family recorded in North America — a useful place to start if you are not certain of your identification.
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