My rats get along fairly well, so I was baffled to come home today to see the worst injuries I've ever seen as a rat owner. They're all getting along right now so I can't guess who the culprit is, but I'm keeping a very close eye on them and I'm extremely concerned... they've all been together a year and there's been no injuries prior to this. One, ear is terrible but can be dealt with. I am concerned about the eye. Nerves (the rat) doesn't show any symptoms of pain. In fact he was super active. I'm wondering what this is. Pupil is definitely lighter on the injured side.