I went to petco today and decided to buy rats, I bought one and adopted one. Naive as I am I thought nothign could be wrong with ones that need to be adopted. Even the petco employee told me nothign was wrong with the rat. I borught them home and introduce them to each other and the adopted rat right away attacked the other one. I seperated them into two cages next to each other. The adopted one still trying to stratch the other one and making aggresive noises. I've come to the conclusion to why no one wanted this freakin rat, It's the meanest rat in the world, even bit me twice. The other one I bought is the nicest thing ever, let's me pet him and stuff.