First of all, it's only a fawn until it loses it's spots and then it's a yearling. Most have lost there spots by the time hunting season rolls around here in KY. Later in the fall, you can see if they have buttons usually if they are close enough. Yes, some fawns disperse from the area by next season but you still are taking a chance of taking a young buck out that may come back when he's older or that may never leave to begin with. Heck, even if I knew he was not coming back, I don't want to take a young buck out of the system. I would take a yearling late in the season if I had struck out so far and I could determine it was not a button buck. Just my .02. I don't judge anyone if they feel differently!