Predator and Prey
As with most prey species, a deer's wide-set eyes lie on either side of its head. Consequently deer can see almost 90 percent of the world around them and pick up movement that humans and other predators, with close-set eyes at the front of the head, cannot. However, deer only have binocular (two-eyed) vision in a very narrow arc directly in front of their noses. If we sit still, deer generally perceive us as just another lump in the landscape.