Hal - Just Wait!
Several years back, I put some feathers of game birds I had shot in with my fly tying supplies. A couple of weeks later, it was practically CRAWLING AWAY! I don't know what they were, but I had to throw out everything, and really sterilize the area after clean-up (just in case!)
Now I am VERY careful of my source for materials, and I am still trying to replenish all of my supplies. I always seem to not have the material I need at a particular moment.
So, take heed. Give all wild materials a good dusting with an insecticide and quarantine 'em for at least a week before using 'em. I wouldn't ever want to see anyone have to go through that unpleasantness again.