Binocular cues occur due to the position of the eyes on the face of most animals. Taking two images from slightly different angles allows the creature to triangulate the location of the item with high accuracy. This is also known as stereopsis.
This can be demonstrated in autostereograms, or magic eye images. By focusing on a 2-D image, you can trick your brain into seeing depth. This random dot image has a shark raised off of the page.
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