Climbing and biting

[Goldenstar]

So, Chi has started to climbing about in her cage and I heard that this was a bad sign? Is this true? What does it mean? Also, she's suddenly gotten into the habit of biting the bars, what does this mean?

UPDATE: I've just placed a carrot in her cage to see if that prevents her from biting. I'm assuming biting is from boredom or distress (knowing Chi these are the mostly likely) so the carrot i hope will help ;~;