AS most of us know the new tamas have a heart beat. I think every one has a different pitch or at least boys and girls do. I put one of my two tamas next to my ear and heard a low beep and then I stock the other one next to my ear and heard a high beep sound. To make sure I used one of those things that doctors use to hear our beet I used it on my tamagotchis and one was higher and one was lower.Can someone plz try if they have more than one and see if they do have different heartbeats