I went ahead and got the rats, they had a good introduction and hung out for well over an hour. I don't know why, but one of my ratties BIT one of the new babies, and there was blood everywhere. We rushed to the emergency vet, expecting to have to euthanize her. Thankfully the vet there was willing to look at her and determined they were only surface wounds, gave her a painkiller, and used that liquid skin stuff on her. We were sent home with antibiotics, and it cost about $160 (which I consider cheap, considering that $100 was for going into the emergency clinic.) They're in their own separate cage until they're large enough to show my rats who's boss! It wasn't the himalayan who was bit, it was the other rat who was super sweet from the start.And you know how I said my rats don't know what they're getting into?I didn't know what I was getting into!