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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.
This head-bobbing action helps make up for an anatomical limitation: an owlâs eyes are fixed in position â they canât move the way a humanâs eyes do. The owlâs varied head movements help it judge the position and distance of things around it â essentially, to triangulate on objects, including potential prey.