Nature has a history of inspiring man-made materials: look to Velcro and swimsuits.
Get To Know Porcupines: More Than Painful Pests - Hobby Farms
Animal Sign, wondermyway
チャーチルの野生動物 (アメリカヤマアラシ 2)
Porcupine quills inspire new medical innovations
Scientists study porcupine quills to improve medical needles
Porcupine quills - Native American Arts & Crafts
Science Ars Technica
Medical marvels borrowed from nature itself including porcupine quills for stitches
Porcupine Quill & Cholla Cactus Spines - Lichen Labs
BWH – Prickly Porcupine: Medicine's Next Top Model?
What Do Porcupines Eat?, Porcupines Diet By Types
CryptoLlama #808 - Llama Adventure Club
Porcupine Quills Aid Device Design - Medical Design Briefs