Olive egger as they have been rightly named is not so much a breed more of a hybrid mixing a dark brown laying chicken with a blue/teal laying chicken. On our farm they are either a cross between Ameraucana and Marans or Cream Legbar and Marans. You can imagine with such a small requirement to be an olive egger there is an extreme variety in their looks. But they do all lay olive colored eggs that are beautiful to look at. These are an auto-sexing breed so they can be sexed at hatching.