I have heard other rat moms and dads mention their ratties chewing on the bars and for some reason, none of my rats have ever been bar chewers.
The only time I have ever noticed it is when one of my boys gets very excited to come out of his house and have outside play time and he will lean up and do a quick excited chew on a bar, like he is saying, "MOM! Get me out of here, I want to play!!" :wink2: So I always associated bar chewing with that, but maybe some rats just chew on the bars for something to do, or they think it's fun, or something else? Anyone else here on this thread have an opinion on bar chewing?