The firefly is capable of producing a "cold light", containing no ultra violet rays, due to a chemical reaction that occurs in specialized light-emitting organs.
This capability is called bioluminescence. It's primary function in adult fireflies is for finding a mate. Usually the ones flying around are males.
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One night I was out by this stream, and the banks/water were glowing and reflecting like crazy with TONS of them all around- it was lovely. Sweet little bugs.
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