Been considering moving him from mice to small rats. Previous owner said he's six and been on F/T mice all his life. So after a couple months , I offered a small F/T rat last week. He hammered it right away and started to eat, but spat it out, so I gave him a mouse. Last night I tried again. No problem-o. Nailed it pronto and it was all gone in five minutes or so. Back-up mouse went in the trash. So happy.