It's not uncommon to come back around and see a chopped up snake in the path of the last pass. Hate to see that, but you can't avoid them if you can't see them.
The strangest thing that happened to me was I had been working a number of hours moving a large pile of dirt that had been there for a couple of years, I came back for another bucket load when I saw this gofer. Apparently on the previous pass I had dug into his den and in doing so the bucket somehow caught his hide and completely ripped the skin off its body. His head was normal but on all of his body you could see the pink of his muscles. And it was clear that he knew he was in a life and death situation and amazingly the little guy was determined to stand up and fight to defend his home and family. As the tractor approached him he took a stance that would remind you of an attack dog. This little guy was snapping his teeth totally committed to fight the monster tractor to the death, and when the tractor was close enough he charged the right front tire and if I hadn't swerved I would have run him over. I continued working and didn't see the little guy again, and yea it was only a gofer but I felt bad about what had happened and absolutely amassed at how brave that little guy was.