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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 have yellow eyes and prominent ear tufts instead of the Barred Owlâs rounded head. Barn Owls are much paler than Barred Owls, with a heart-shaped facial disk and longer legs; they occur in more open country more often than forests. Great Gray Owls of northern North America are considerably larger and grayer, with yellow eyes. They are often active during the daytime.