well, it's not something I would have thought of either. I learned from experience. basically, my first flock was mostly hatchery quality RIR. the oldest hen (an Americana that I had gotten from my grandma when she moved out of town) ended up dying. the chicken probably died of old age, but the RIR ate her. then they started tearing pieces of flesh off a pair of slower moving broiler birds we were keeping them with..................... ended up culling the entire flock, bc the RIR were terrifying, and the meat birds had necrotic open wounds from where they'd been bitten by the RIR.