We recently introduced a new Kitten into our household - and all is going remarkably well. Cricket mostly accpets the new Kitten (except for the occasional bout of jealousy) and they happliy share the same lap and play together. However - Cricket bites the back of the Kittens neck, not to the point where she screams in pain or anything - mostly he does it as part of his grooming her. I was wondering why he would do this? Is it a sign of agression that I should punish?