I have 13 chicks that are 75% English Orpington and 25% Australorp. They range from 7 weeks to 5 weeks. I’ve been told they are harder to sex until 8-10 weeks of age. When they reach that age, what will I be looking for to distinguish the different sexes? Bigger combs and wattles? I’ve also read about vent sexing. Has anyone had any luck with that?