By the way, if your BP doesn't tries to start swallowing some part other than the head, don't worry about... when they have difficulty finding the head, they often jaw around until they find it. Some BP's can get spooked if you disturb them while they're eating, and then go off feed for months because of it. There's no way he would try to swallow it sideways, so you don't have to worry about that happening. The only thing to worry about is swallowing tail first, but I've never seen this happen in a good sized prey item for the snake; it usually only happens when the prey is too small.