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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.
Some subspecies are paler. All have large yellow eyes. Great horned owls can turn their heads 270 degrees either way when facing forward, but they cannot turn their heads 360 degrees. Great horned owls swoop down on passing prey and seize it with their talons.