If you peer into an owl’s ear-hole, at least in a saw-whet owl, you can see its eye.

If you peer into an owl’s ear-hole, at least in a saw-whet owl, you can see its eye.
Proportionate to the size of their skull, saw-whets probably have among the largest ears in the animal kingdom. Not only are they big, but saw-whet ears are doubly asymmetrical. Each ear is shaped slightly differently than the other, and the ears are also offset from one another. These adaptations allow the bird's "micro-processor" to better triangulate on sound and almost instantly calculate the precise location of prey in utter darkness - even a vole moving under the snow.

Source:
http://jimmccormac.blogspot.ro/2012/11/northern-saw-whet-owl.html

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