So I have a new kitten (8 weeks). She's adorable as anything but she engages in a lot of "play" fighting (scratching, pawing, biting, pouncing, etc). It doesn't bother me at all ( I find it cute that she thinks she can take me down ) but a) I don't want her to develop into an aggressive cat, but also b) I'm just wondering how sure we are that cats actually "play". Playing seems like such a human concept, that it seems weird to ascribe such behaviours to cats. She certainly chases after balls, yarn, etc, but how do we know that it's just playing, as opposed to a bad attempt at hunting?