Hi all - I was wondering if anyone had any insights as to why Bill the Bunny keeps chewing on his metal cage? He scratches at it too.

He has a large cage with a large run - so he isn't trapped in there - he will even go in his cage when he has full run of the apartment just to chew on it! He has toys galore - he has hay - he has a crazy bunny mom here that plays with him several hours a day!

I can't imagine it's because he's bored - because in the middle of playing he will go in his cage and chew - I'm nervous about him chewing on the metal - any insight?