I have 4 chicks that are 4 days old. I had a couple more hatch and when I put them in the brooder box with the others, they older chicks (one started it, a bantam at that) just downright mauled the 2 new chicks. She had them on their backs, and just was like a machine gun on them. I have never had this sort of thing happen before. There is plenty of room in the brooder, fresh pine shavings, plenty of heat. What's going on? I've since taken the new guys out and they are in their own brooder and peace has been restored.