I saw the same thing last spring, and wasnt sure what it could have been. I found around 10 tail fan feathers on the backside of a log in a recently timbered lot. My guess is that a fox got him, because I had seen foxes around while hunting, but im not sure why only fan feathers would be left. I looked around but couldnt find a carcass anywhere. The feathers were spread out in about a 5 foot radius.