Ultraviolet perception is incredibly common in animals—just not in humans. Ed Yong dives into the history of how scientists saw the light. The following is an excerpt from An Immense World: How Animal ...

Shine an ultraviolet flashlight on flying squirrels, and they glow bright pink. Catch a scorpion on a full moon, and you’ll notice that it’s a haunting blue. Rays and sharks can turn neon green, while ...