Wow, thanks for the info guys. If I ever have any problems with my ratties, I am now fore-armed.
Not to completely hijack the thread, but what does it mean if one of my rats has some blood dried around her eyes? It is not alot, but it is there, and it concerns me. She is a nursing mother, and I use aspen shavings for bedding. I think that I read somewhere that their tears are red so they are mistaken for blood, but I don't remember where I read that.