However....as the eggs have started hatching, the buff seems to be very aggressive towards the hatchlings. She's already killed one and wounded another (s/he is on the mend!)
Is it normal for a hen to want to kill its young? I find it odd, especially since she is the broodiest out of the 3.
I'd separate her, but the Sussex's are on the smaller side and need the buff to cover up the rest of the eggs they can't cover.
I've been very consistent in checking for hatching eggs and already hatched chicks to ensure the buff doesn't kill or wound any more chicks.