They are a natural part of the environment. I wouldn't worry about them, unless they give you a reason. If they become visible, if the dogs notice them, if they distract from your mission, then try to catch or shoot the little darlings. Softshell snappers taste pretty good. Personally, I have never been hungry enough to get past the stench of a hard shell snapping turtle on the hoof.

Teach a man to grow fish...
He can teach to catch fish...