I am currently feeding live adult mice to my little guy. He didn't eat for 3 weeks after I first got him and his weight was dropping so I buckled. He has since eaten 3 live mice for me. Once he gets back up to weight I intend to switch him over to f/t if possible. I especially wouldn't want to feed him live adult rats. I live in a place where it would be extremely difficult to get live rats anyways unless I bred them, which I have no intention of doing.