This platypus glows

Under a UV lamp, this platypus turns into a blue-green night-light.

In visible light, its fur looks brown. In a study of three museum specimens, the fur absorbed ultraviolet light at 200–400 nm and re-emitted visible light at 500–600 nm, making it fluoresce green or cyan. 1 Researchers still do not know why the platypus does this. 2

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