Hi there i have two guinea pigs they are male and female and lived together for about 6 months however they had a fight which upon my female (Beatrice) lost an eye and was operated upon. They have lived in seperate cages side by side since and seem to be quite happy chatting through the bars. It is now 6 months on and last night Beatrice was making a sort of bird calling noise i never heard her make before, can anybody give me some information on why she would make this noise?