I noticed one of the Tibetan (I think? It's super dark) chicks in the brooder really getting after the others, pulling feathers and pecking at feet (so much so that it drug another chick by its leg!) so I removed it and 3 others who were pretty fluffy. However this behavior has moved to the brooder now, I routinely see chicks squeak and jump away in pain because someone has pecked at their feet! They have food available, they've found the food, there's no mealworms or anything, I'm curious if this is normal behavior or if my one Tibetan started it all?