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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 eyes of owls look forward in a fixed position and cannot move to the side, as the human eye can. Therefore, to see to the side or back, the owl must turn its whole head. They see extremely well at night. Their hearing must be extremely acute also, for it is known that a barn owl can strike a mouse in the dark.