Hatchet

From the text:

His fingers gingerly touched a group of needles that had been driven through his pants and into the fleshy part of his calf. They were stiff and very sharp on the ends that stuck out, and he knew then what the attacker had been. A porcupine had stumbled into his shelter and when he had kicked it the thing had slapped him with its tail of quills. He touched each quill carefully. The pain made it seem as if dozens of them had been slammed into his leg, but there were only eight, pinning the cloth against his skin. He leaned back against the wall for a minute. He couldn't leave them in, they had to come out, but just touching them made the pain more intense.