4. The quills have barbed ends.
So, if you get quilled by a porcupine, getting their quills out of your skin is going to be a long, hard and painful process. The shape of the backward-facing barbed ends have recently inspired a new type of hypodermic needle. They are exceptionally good at two things: penetrating the skin and staying there. Well, the little poor creatures have to defend themselves somehow, don’t they?
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