I have corns that eat f/t that just slither up & start swallowing. They won't constrict. I have also seen the start-in-the-middle thing once with a friend's smallish albino burm who was eating rabbits at the time and tried to fold them in the middle & couldn't figure out WHY they couldn't get their mouth around the rabbit of the day. My friend had to REMOVE the burm from the rabbit & then offer the rabbit head first. Thankfully, the burm was on p/k but the snake looked so frustrated that this wasn't working.![]()