Why Animals Also Get Gray Hair

Liz Langley, National Geographic
Gray hair can be bane or beauty, depending on who you ask.It's also common among primates, leading one reader to inquire via Twitter, "What is the purpose of hair turning gray in primates and humans? Status, lack of status?We wonder about that, tooafter all, if we make it to the golden years, how come all we get is a head full of silver?

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