Porcupine quills are covered in - QI - Quite Interesting

Porcupine quills are covered in their own homemade antibiotics because they frequently fall out of trees and impale themselves.

Can a porcupine shoot its quills at predators?

Interfacial Mechanical Behavior in Nacre of Red Abalone and Other Shells: A Review

Why the Porcupine Has Quills': Ojibwe winter story - Detroit Lakes Tribune

Study of Impact Resistance Based on Porcupine Quills Bionic Thin-walled Structure

QI Series L, Episode 14 - Little And Large - British Comedy Guide

a. The quills of a porcupine are distributed across the posterior two

New Data on Morphometry and Appendicular Skeleton of South Indian Hedgehog Paraechinus nudiventris Horsfield, 1851 (Mammalia: Eulipotyphla: Erinaceidae) from Urban Landscapes of Tamil Nadu, India

My baby got after a porcupine today. : r/AustralianShepherd

Extra Long African Porcupine Quills Pack of 10