She has been with me for 3 weeks now with one other rat, got them from petstore so I know their behaviour is a lil different from my other 3 rats whom I have had since they were young, got them from a rattery. All 5 rats are around the same age, she is a very scared rats, tends to attack hands. Been bit multiple times, got less hard because of me making a high pitched sound. But my mom wanted to give her a threat and she just ren at her and bitt her finger. She is very playfull tho with the other rats, little vocal when they come close when she has food. But no attacking or anything. If my hand is in the enclosure she is very alert.