Why Porcupines Don’t Get Hurt by Their Own Quills ????????

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Porcupines can accidentally poke themselves — but they don’t get infections. ???? That’s because North American porcupines have evolved with a built-in safety system. Their quills, over 30,000 of them, are hollow hairs tipped with microscopic barbs that hook easily into skin. Unlike African porcupines, though, their quills are coated with a natural waxy grease that works like an antibiotic. So even if they fall from a tree and land on their own spines, they stay safe. Scientists at Harvard are now studying these barbed, self-healing designs to create better surgical staples — inspired by one of nature’s cleverest defenses.

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