They are really neat turtles.
There is a website in Japan that is for alligator snapping turtles, Staurotypus and Claudius. It has some really great photos but of course, all of the text is in Japanese. One thing that I noticed is that all of the Claudius and Stauros are really obese. I guess they become such 'pets' that it is hard to resist feeding them all the time.
I wish I could remember the name of it but I found it by googling Staurotypus.