All I know is when I feed my BP's, some of them (I'd say 3 out of 10 each time they feed) will take the rat feet first. They are doing just fine. Also, about regurgitation. I guess that may make sense. But you have to take into consideration that once it is inside the snake, it is decomposing at a super fast rate. By the time the snake MAY need to regurge, the rodent would be in a state of decompostion where it wouldn't matter what end was to come out first; it would all come out decomposed.