I've been feeding my 12 year old corn snake one adult mouse (frozen/thawed) once per week. She seems to always be hungry. I recently switched to a small rat and she was able to go a week and a half before she acted really hungry again. What do y'all feed your full sized snakes and how often do you feed them? Is it okay to go back and forth between smaller more frequent feedings and larger less frequent feedings or is consistency the key?