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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 helps make up for an anatomical limitation: An owlâs eyes are fixed in position, so they simply canât move the way our eyes do. To look up, down, or to the side, an owl has to move its head. They have very flexible necks and can do 270 degrees of a full head turn, looking over one shoulder, around the back, and almost over the opposite shoulder. And after a few of these head-bobs to triangulate on their prey, they rarely miss.