You'll never know if it's an ameraucana. Even if it looks like one, acts like one, lays a blue egg like one, it may still turn out to be an easter egger. For example, here is what happened to me. I bought a line of ameraucanas from a very well known ameraucana breeder who posts here regularly. They were sold as amerauacanas. I've had them for 3 generations and wouldn't you know, some of this year's pullets just started laying and I got some pink and green eggs from them. The previous generations were laying only blue eggs, but all of sudden my birds morphed into easter eggers overnight. These are penned birds that have been kept pure. Moral of the story: Even those who think they have ameraucanas, probably don't - at least according to the ABC.