I have notice that Noggin our 18 week old grey baby has been eating the hair at the top of her tail...only when she is alone ore at night in her cage..I was thinking it is because she is nervous or sad...not mange or any thing that I had read..She was hurt in the head when she was just born and then again in the shop by falling two stories.She is a great one ,,She will not go in the wild ,she will not make it far..We had released 28 of them but Noggin will not be released..She does need us around with us and when we are not around by working she had been eating her tail and eating pine cones..any help that has been dealing with this will be helpful and thanks..Tim Moore