I get the question often about Alligators and all the turtles they are seen with.
Do they eat them?
The short answer, yes.
The larger turtle here (click image to view full size) has several round holes in his shell. Teeth marks.
It’s like being really hungry and all you have is a very hard Walnut, or any nut. You would bite it for food. But, if you found anything easier, you would drop the hard shell and move on.