Hi Nicole, Not sure about the worm thing, but...when my ferts were kits they tended to be full of energy, more agressive and more nippy. I think it may be a baby thing. As far as being agressive when eating, at the pet store they would have to fight and eat fast to get a bite in before all the other ferts got to the food sometimes. Most of mine out grew that, but for one, it's just the way he is. I have numerous food bowels, 4 all together. This helps and they are always full. As far as squeaky toys, they hate them. A couple of them will attack when they hear them. It might hurt their ears or sound too much like an distress call and scare them. Though they are good, for calling lost ferts. Good luck, suzi [Posted in FML issue 4419]