how do birds achieve binocular vision

Richard Norman RNorman at
Fri Nov 24 05:57:37 EST 1995

>Could anyone explain to me how birds achieve stereoscopic vision even 
>though their optic nerves are totally crossed??
>--L. C., U. of Washington.

Do you mean stereoscopic vision literally, or just depth perception?
There are many monocular cues to depth, including comparing two
views from one eye taken at different head positions.

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