A hawksbill sea turtle that can light up like a neon Christmas tree is the latest addition to a menagerie of animals with an ability known as biofluorescence. These luminous animals can reflect the blue light hitting a surface and re-emit it as a different color—the most common being green, red, or orange. Biofluorescence is different from bioluminescence, where animals either produce their own light through a series of chemical reactions, or host other organisms that give off light.
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