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With regards to the real-world, the NOAA says that some deep-sea crabs have low-level UV sensitivity in certain pigments. This would seem to indicate that creatures there may emit UV light - which ...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:49Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/45743 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/