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Millipede genitals glow bright colours under ultraviolet light.
The bizarre discovery is an accidental discovery from scientists who were trying to find an easier way to tell different species of the animals apart.
UV - Light - Genitalia - Millipedes - Glow
They succeeded because they discovered, when exposed to UV light, the genitalia of different millipedes glow.
Many adaptations allow animals to adapt and survive, but there appears to be little reason for the illuminating genitals as the creatures have poor eyesight.
Petra - Sierwald - Study - 'Millipedes - Images
Petra Sierwald, who led the study, said: 'Millipedes don't see well at all, they don't see images. I don't know if they see any colour.'
The creatures often look very similar to other species and the difference in UV glow may come from a protein in the millipede exoskeleton.
Light - Return - Hues
It may absorb visible light and return hues of green, yellow and...
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