There has been a long debate among people about whether organic material is in fact, MOOP. well, it is. ANY material not otherwise natural to a locale is considered Matter Out of Place.

Please gently remind your friends to keep their feathers in place... if you can get creative enough to ensure they don't blow away in an 80 mph dust storm, by all means do it! (And if a few loose ones get away, remember that we all make mistakes...while you do your part picking up your neighbors lost cigarette butts and sequins.)