knowledge treasure on Instagram: "This is the science behind porcupine quills, which are one of nature’s most effective defense mechanisms. Porcupine quills are modified hairs coated with thick keratin and equipped with microscopic barbs at the tip. These barbs make it easy for the quills to penetrate skin with minimal force, but very difficult to remove, as they expand and anchor into tissue once embedded. This design reduces damage to the porcupine during a defensive strike while maximizing th