Yes. They are often black with red highlights to the neck feathers because black copper Marans are sometimes used to create olive eggers. There are also barred olive eggers. They can inherit that from cuckoo Marans or cream legbar parents. That said, the black chicks do look like Australorps to me, but you won't know for sure until they are older. Post updates if you can.Can Olive eggers be black? I thought the other ones were.