After getting treats for my degus today, I only saw one run to the cage door, and upon further inspection, I found the other one on the cage floor and it wasn't a pretty sight. Apparently they had gotten into a fight last night when I was asleep and I didn't wake up to it. They had never fought before this, and were both very healthy and active, never an aggressive moment in their lives, even after two years of owning them. Has anyone ever experienced this before, or can anyone give me an idea as to why this might have happened? I was very much looking forward to having them both for several more years and now this. I just don't know why..