Good evening, I have had rats for YEARS, and have never experienced anything like this.... one of my rat has bite marks all over her (not from mites, fleas or any parasite, but from one of the other rats)! They ALWAYS have food and water, there are so many fun toys, huts, hammocks, ladders to clime, and hide always in their cage, so I’m not sure what is happening. I have witnessed little fights before, but it was nothing to where I needed to separate anyone. Now, the one female that the bites are on has always gotten along with the other rats, and they’ve been together for a little over a year. They still all snuggle up together during bed time, and then get along during play time when I get them out to play and pet them daily. Any idea what’s happening?