I watched a snapping turtle bite the bucket of a small backhoe I was running while trying to get the turtle out of the hole we had to work in and it put a pretty deep scratch in the steel bucket. I'm REALLY glad we decided not to try and get it out by hand now.
That was brutal! I caught a snapper a few weeks ago, he was fairly aggressive. Not only do you have to worry about getting bit they have some nasty claws too.
Not a real good pic he was pissed and my kids were around and didn't want them getting too familiar.