I love the colors and markings on their feathers. These are neck feathers where they transition to the body feathers.
One of the reasons I think they may not be true Ameraucanas is because they have tails - and I understand the real ones don't.
This photo didn't turn out sharp enough to really capture a detail of the feathers, but you can see that this white so-called Ameraucana also has a tail.
A Silver Laced Wyandotte getting her adult markings.
Detail of the "laced" feathers.