We lost one of the kits last night. It got separated from the litter, and it was dead this morning when I found it. So, now we're down to four. Olivia has been doing a good job of covering them with a layer of wool, so I don't know if it happened while they were nursing or it wandered away from the litter. I read in my rabbit book that mother rabbits don't pick up their babies like cats to move them, so it had to fend for itself through the night. It had started growing its wool and was covered with a pretty sheen of dark grey. I'll be glad when they get a little bigger and are more protected from the elements. I know death is a part of raising animals, but it doesn't make it any less heartbreaking.