There's a few how-to's online. I think salt and or borax (powder) soap is the best bet, but I do recommend looking up some tutorials! Works on birds, mice, some bugs. Do know your laws though! I know America doesn't allow collecting most birds.
Mmmmm..... From my understanding? No. :S It's suppose to be no bird parts since you can't prove where you found said feathers. Was the bird alive, dead, dropped it? Legally it's your word against the laws soo... It's safer not to collect. I'd say look into more on your own just to be safe though! Ask your local Fish And Wildlife agency!