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Owls have extremely large eyes in proportion to the size of their heads. In some of the larger species, such as the Great Grey Owl, the eyes are larger than those of most humans. Although owl eyes are well adapted for great visual acuity, there is a drawback.wls have extremely large eyes in proportion to the size of their heads. In some of the larger species, such as the Great Grey Owl, the eyes are larger than those of most humans. Although owl eyes are well adapted for great visual acuity, there is a drawback.
great horned owls in length ranges from 18-27 inches and have a wingspan of 40-60.5 inches. Females are larger than males.an average adult being 22 inches long and wingspan of â¦ 49 in and weigh about 3.1 lbs.arn Owls are pale overall with dark eyes that are not as huge as other owls. They have a mix of buff and gray on the head, back, and upperwings, and are white on the face, bo â¦ dy, and underwings. When seen at night they can appear all white.