Our eyes work together to produce an overlapping visual field. Some scientists have proposed that this is what provides humans with depth perception which helps us to reach out and grab items and/or manipulate objects. Some prey animals, for example, rabbits, have their eyes spaced out to the side of their head to help them perceive threats with their wider visual fields. This implies that humans in prehistory were either not prey animals or that the ability to manipulate objects outweighed the benefits of a wider visual field.
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