Carla,
I am not sure how you will tell the marans apart from the other chicks, but to distinguish the Jersey Black Giants from the Black Australorps, look at the bottoms of their feet. Black Giant chicks have yellow on the bottom of their feet. The bottom of the feet on Black Australorp chicks are pinkish-white colored.
I am not sure how you will tell the marans apart from the other chicks, but to distinguish the Jersey Black Giants from the Black Australorps, look at the bottoms of their feet. Black Giant chicks have yellow on the bottom of their feet. The bottom of the feet on Black Australorp chicks are pinkish-white colored.