Sissy is right--I would never put a snapping turtle in my fish pond--I used to catch them as a teenager on trot lines--we butchered them and ate them ( I know I'm a hillbilly, Anne's told me many times) anyway their claws are very sharp and they are strong --in fact the whole time you were cutting the hide off of a headless turtle their legs were still moving (we cut the head off first or they would get you instead of the other way around--same with the severed head it would still snap on a stick 20 minutes afer it was cut off--now thats a tough animal ) also they have a little worm-like appendage on their tongue that they use to entice fish ( or your Koi) into their open mouth. I actually like and respect snappers and alligator snappers but their holly terrors--although they do taste like chicken, LOL. they can live 70 years in captivity and its though that they may live up to 200 years in the wild, adult male alligator snappers can weigh in excess of 225 lbs have a shell 2 and 1/2 feet or more accross and sever fingers and toes easily--kinda the jaws of fresh water, lol