Scientists from University College Cork have discovered evidence of ginger pigment molecules in fossilised frogs dating back 10 million years, suggesting that the genetic mutation that causes red hair has been around for a long time. The findings will help Scientists better understand the original colors of extinct organisms and the evolution of colors in animals. The research also revealed that the pigment, pheomelanin, is toxic to animals, and the fossil record may provide clues as to why it evolved. In humans, red hair has been mentioned as far back as Ancient Greece and is most common in Ireland.

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