Tying Feathers

Do you ever want to try and steal some feathers from a duck?  I've come close to considering this one a few times.  Just imagine what all these feathers would look like on a fly.  If we could harvest these without killing the duck, it would be a great renewable source.  Instead of buying a bag of feathers, each tier would simply keep a small flock of various birds...  I'm sure someone would consider this cruelty to animals, but if I was this duck, I think this solution would be much preferred over getting shot...