User blog comment:VedranTheII/Pretentious Diaries 3: Half-Grimm...do they even work?/@comment-27966940-20160423043820/@comment-26397825-20160423044408

Yes. Because neither a human or a bird grows feathers at a fats enough rate for it to be useful for anything, birds aren't designed to fling their feathers around like the Nevermore does (which does it because it's a monster, not because it'sa bid), and humans don't fling anything around like that either.

Porcupine's fling their quills and grow them back really quickly, however.