Special thanks to grams88 for really helping to start narrow things down. I'm just glad I didn't have to do the letter thing over and over!
Hmm, so porcupines can climb trees huh? Yikes, imagine getting hit with a rain of spiny quills from above...
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Anyhow, I've thought of my thing. Ask away! Hopefully not too difficult, but if it turns out problematic, I can redo with a different thing by popular request.