Here in Ontario Canada I am allowed to collect road killed animals for use in fly tying as long as they are not on the endangered/threatened list, a raptor or a migratory song bird. Waterfowl are fair game because they can be legally hunted during open seasons. The only stipulation here is that I must inform our MNR that I have acquired a fur bearing animal by going on their web site where a registry has been set up for folks like me to compile a personal file on what I have in my possession. I print off that file and always take it with me whenever I do tying lessons or volunteer demos, just in the event that someone questions how I acquired those materials and then calls the cops on me. One always has to be legal in this game of ours or it could land you into serious problems down the road.