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Reindeer by mitchanx: Rangifer tarandus are thought to be the only mammals that can see ultraviolet light. A study in 2011 revealed that reindeer can see light with wavelengths as low as 320 nm, considerably below the human threshold of 400 nm. It is thought that this ability helps them to survive in the Arctic, because many objects that blend into the landscape in visible light, such as urine and fur, produce sharp contrasts in ultraviolet light. http://en.wikipedia.org/wiki/Reindeer…