I'm definitely going to look into getting some ingredients to mix my own food, and these "lab blocks" sound like a great deal, not to mention practical and healthy. I've been checking on them about once an hour throughout the day, and they really don't seem to be too interested in chewing the plastic, though this doesn't mean that they won't in the future! I'll try to keep toilet-paper rolls in there to keep their teeth occupied, but of course if they want out, they're going to try... The little brown girl with the white diamond-shaped "crown" is supposedly already pregnant, or so said the lady at the pet store. I hope she is... After a couple litters, I should be able to tell myself, but for now she just looks like a slightly-chubbier-than-normal little girl.