Why has your Mexican redknee Zoe gone bald around her rump she is 9 months old and you had her 1 month she's quite a flicker but you don't think she should be bald and have bright orange skin showing?

Well if your talking about a Baboon, first of all its not going to be Mexican. They are supposed to have bald, reddish rump. If your talking about a "flicker" as in flicking poo, this is common when trying to domesticate a baboon.