We have a duck pen with three female ducks and one male. We recently introduced three turkey chicks into the pen and have had them for several weeks with no incident. When I went out to the pen this morning two of our turkeys had died, there we're blood spots on their head but none anywhere else that I could see. Our female ducks recently hatched some eggs and we took the ducklings from them and put them in a brooding box. Is it possible that the ducks attacked the turkey chicks and killed them? Or do I need to be looking for some kind of disease?