My cockatiel, Louie, has recently gotten into this phase of eating/chewing on everything in sight! He's about 8 years old. He keeps trying to eat our chairs and couches with cloth material on them. He gets angry if you try to stop him and hisses! When he's not chewing on the furniture or things of the like, he's perfectly fine. He's never done this before. Does anybody know why? Also, what can I do to help him stop? Is there a toy or something of the sort that he can focus his energy on rather than furniture? Thanks!