A baby grey is just that, a baby, she will be testing you because she is learning. Don't assume she is being mean. When Brutus started biting we said, "Be nice" and after a while he understood the amount of pressure that is acceptable. Of course when they are older, sometimes they bite to be mean. I have learned to read our grey's body language for signs of aggression or of being over-stimulated. At these times, he is more prone to misbehave, so I do not handle him. If his eyes are pinning that can be a definite danger sign! I try not to put Brutus in a position where he is apt to misbehave because I think, then, that bad behavior can become repetitive. It becomes sort of like training and reinforcement for bad actions rather than good. (If that makes sense?) I have had Brutus for almost 3 years, and by following these guidelines---he RARELY bites, and if he does, it doesn't hurt, and feels more like a good squeeze than a bite. Now my husband is not his favorite, and we have learned that Brutus will bite my husband, especially at night (he has broken the skin after an attempted kiss), so he does not try to handle him at night. In the morning, however, Brutus is a cuddle-bug with my husband. I also think my husband forces the issue with Brutus rather than looking for cues. I think respect for your grey and his moods will set up a good situation for bite-less behavior.