This is a male box turtle that hatched here several years ago. I found it as a hatchling while raking leaves. It had a small shell injury above it's head that made it easy to identify as it grew over the years.I started getting them ready for winter a couple weeks ago and found a pretty severe injury that had healed nicely without my help. Here are a couple pics, In the first pic it's hard to see but you may be able to make out the old injury above his head. The second pic is the best I could get to show the new injury, the complete leg is gone and his penis is partially exposed. There in not a scratch anywhere on the shell. After looking at everything, It had to have been done by a common snapping turtle. This is the first time that one of my snappers has injured one of the other turtles. I can't see any other way an injury like this could happen under the conditions they live.