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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.
The Strigidae owls are the typical owls or true owls, and this family includes the majority of owl species. They are heavily camouflaged birds and have large heads and round or oval facial disks. The Tytonidae owls, or barn owls, have more typically countershaded plumage and heart-shaped facial disks, and their body shape is a bit more tapered and slender than the true owls. Regardless of which family these birds belong to, however, they are always able to capture birders' interest.