@ambergem My English orps certainly develop slower than many other breeds, and certainly slower than some of the production birds bred to mature early and lay in about 4.5 months. I don't have experience with American SOP orps...but I will be keeping an eye on the Australorp and hope it doesn't develop too much faster than New Hatch. When I hatched and raised a red star rooster and an English Orp together, the red star really did everything faster, and treated the orp he was a chick, and Star a dad, rather than a sib. He showed the orp where food was, etc.