Copperhead Snake on Dead Leaves

Copperhead Snake on Dead Leaves

Copperhead Snake on Dead Leaves, study for book Concealing Coloration in the Animal Kingdom, c1910-1915, by Abbot Handerson Thayer. Courtesy the Smithsonian American Art Museum

Evolution has favored the modification and expansion of primate vision. Compared with other mammals, primates have, for example, greater depth perception from having forward-facing eyes with extensively overlapping visual fields, sharper visual acuity, more areas in the brain that are involved with vision, and, in some primates, trichromatic color vision, which enables them to distinguish red from green hues. In fact, what separates primates from other mammals most is their much greater reliance on vision as the main sensory interface with the environment.

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