The northern hawk-owl (Surnia ulula) is one of the few owls that is neither nocturnal nor crepuscular, being active only during the day. The species is sometimes called simply the hawk owl, and is also known as the Canadian Owl and Hudsonian Hawk Owl. It is a medium-sized, slender owl with white-spotted brown upperparts and brown-barred white underparts. The grey facial disk is partially bordered by a thick, brown stripe that extends to the upper breast. It lacks ear tufts, the wings are long and quite pointed, the tail is long and rounded. The Northern Hawk Owl occurs in North America and Eurasia.