Human aggressive mouse!
I recently purchased three little male mice from a pet store. No problems amongst any of them, they seem quite happy. Two are very sweet and loving but one is super aggressive. It started with him constantly jumping at my hand and nipping. He doesn't seem to be at all afraid. When out playing he will chase my hand to bite. At first we thought it was him just associated with food but then he started behaving this way to my boyfriend. Before this he would happily sit in his hand and having the bf pick him up was the only way I could move him anywhere or even reach in the cage to change food and water. Now he is biting everyone to the point of drawing blood! He even bite my one year old nephew when I wasn't paying attention. What do I do? I can't keep him if he is always going to behave this way.