The young birds are demanding, and finally when on the verge of adulthood, they become brutal. Competition for the food is fierce.
I can be in another part of this swamp and I know when an adult Heron returns to a nest. The deep squawks and screeches are incredible. Fighting breaks out immediately between the chicks.
Most Great Blue nests have 2 juveniles but I know of one with 3 survivors.
Adults will stay on the nest only a short time after providing food. They can be hurt if they stay longer.