Will a Hieroglyphic river cooter turtle bite?

I have a hieroglyphic river cooter and he has only ever tried to bite twice in the year that I have had him. I believe this is because the first time my brother was wiggling his finger in front of his face and the second was just before feeding time, because I have them on a feeding schedule they know when they are going to eat...that might be why he tried to bite. It didn't hurt at all, it was just a bit surprising.