My boy BCI ate that jumbo rat which he refused for a week. Why did he refuse to eat it for about a week? I made a mistake. I moved him to his new big adult enclosure and i did not provide him with a hide although he always had a hide in his old enclosure. I thought he might get used to not having a hide. And because i use Aspen, i thought he can burrow himself. He did burrow himself a lot and refused to eat, obviously he did not feel secure without a hide. It was unusual for him to refuse food when his stomach is empty. So i knew something was wrong and i gave him his hide back. And the next day he ate that rat.