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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.
General description: The great horned owl is a large bird of prey with large yellow eyes and feather tufts that look like horns. That's where it gets its name. Length: Between 18 and 25 inches. Weight: From three to five pounds. Color: Reddish brown, gray, black and white.