It comes and goes. My male has been out alot lately,but my female hasn't been out much at all. I'm actually surprised you got him to eat in the morning. Mine are painfully picky. Neither one is interested in food in the morning. The male won't eat a totally white rat. The female won't eat if I handled her earlier in the same day. You just have to watch them and take note of their behavior. They have reasons for their behavior. I still haven't figured out the dislike for white rats though. Maybe he doesn't like vanilla.