Topic summary
Motion parallax
Extracted from the Wikipedia article Parallax.
Visual perception
Some animals also use motion parallax, in which the animal (or just its head) moves to gain different viewpoints. For example, pigeons (whose eyes do not have overlapping fields of view and thus cannot use stereopsis) bob their heads up and down to see depth. Motion parallax is also exploited in wiggle stereoscopy, computer graphics that provide depth cues through viewpoint-shifting animation rather than through binocular vision.