I have one that had three mouths when I got it. It split resulting in one large piece and one small piece. I wasn't home at the time, so the smaller piece ended up in the rocks somewhere. Presumed dead. The remaining portion keeps trying to split again, but it doesn't seem to have enough pedal disk left to pull itself apart. It's been doing this for about two months. I'm seriously thinking about getting a razor knife and helping the thing out.