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Freaky Fluorescent Frog Found

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In March 2017 a team of Argentine and Brazilian scientists announced that they had found a tree frog that naturally fluoresces, the first known amphibian to do so. The polka-dot tree frog (Hypsiboas punctatus) is a small frog about 3 cm (1.2 inches) in length that lives in the Amazon basin. Its coloration is a drab green, with reddish, white, or yellow spots or stripes, but under ultraviolet light it glows a bright fluorescent green.

In fluorescence, light is absorbed and then reemitted. Many sea creatures fluoresce, but among land animals, only some parrots and scorpions do this. (Creatures such as fireflies are bioluminescent and generate their own light through photochemical reactions without having to absorb it first.)

Interestingly, the molecules that the polka-dot tree frog fluoresces with have been previously seen only in plants, and the frog is quite bright in fluorescence, shining about 18 percent as bright as the full moon. The scientists planned to study the frog’s eyes to see if it can detect its own fluorescence and other related species of frogs to see if they have the same ability.

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