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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.
Barred owls are one of the larger owls in this area. On average, they range in size from 17 to 22 inches, have a 39 - 43 inch wingspan, and weigh 1.5 to 2 pounds. Unlike most other large owls in this area, they have brown eyes (as opposed to yellow).here is some belief that barred owls are one of the factors in the decline of spotted owls. Great horned owls are the most serious predatory threat to the barred owl. Although they often live in the same areas, the barred owl will avoid parts of its territory occupied by a great horned owl.