If my snake would have just grabbed the tail I would have grabbed the mouse to make sure it wouldnt bite her.. Not just watch it happen.. When I did feed live the adult mice I was getting were 30 grams and male now that I'm on ft there 18-22 when I weigh them frozen.. It's not hard to get them to switch.. My 300g one that always took live his whole life switched right over no missed feedings at all