that is not 腫瘤. :P

尾部腫<--that's his "ball" :*P

黃金鼠尾部 VERY SHORT.

when 黃金鼠 in warm weather(or he feel hot) .. his balls 腫腫的



usually, his balls 腫腫的 all the time!! :P

我有養黃金鼠的經驗 :)