Platypuses glow an eerie blue-green under UV light – Livescience.com

Duck-billed, egg-laying platypuses
just got a little weirder: It turns out their fur glows green and blue under ultraviolet
(UV) light.
Under visible light a platypuss extremely dense fur which insulates and protects them in cold water is a drab brown, so the trippy glow revealed under UV light on a stuffed museum specimen was a big surprise. 
Biofluorescence absorbing and re-emitting light as a different color is widespread in fish, amphibians, birds and reptiles. But the trait is much rarer…

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