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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.
Much of its size is deceptive, since this species' fluffy feathers, large head and the longest tail of any extant owl obscure a body lighter than that of most other large owls. The length ranges from 61 to 84 cm (24 to 33 in), averaging 72 cm (28 in) for females and 67 cm (26 in) for males.he underparts are light with dark streaks; the upper parts are grey with pale bars. This owl does not have ear tufts and has the largest facial disc of any raptor. In terms of length, the great grey owl is believed to exceed the Eurasian eagle-owl and the Blakiston's fish owl as the world's largest owl.