Cool shot. These are some of my favorite animals. Are you sure these are aren't two males. They get pretty aggressive during their breeding season. I've seen males fight before like this.
I don't know, just looking at them I'd say they were brothers, or brother and sister. He's got a ornery grin on his face and looks as if he's trying to frustrate the other one. I guess with turtles wrestling doesn't get as rowdy as with human brothers. hah hah. Great shot. I love the clarity and the colors. Good job.