barred plymouth rock?

[emchick53]

I bought 4 barred plymouth rock pullets, but one is mostly black. I am assuming it is another breed (and not a rooster, I hope). Any ideas? Here is the best pic I have of her. She is the biggest chick I have and also her legs and feet are more black than a light color. Also, if anyone wants to guess the breed of the white one next to her, I'd appreciate that as well Thanks!
Edit to add: I have had them for 4.5 weeks.

 

[Chicken Girl1]

Does she have puffy cheeks? If not I think she is an Australorp but if so I would say an Easter Egger.

 

[emchick53]

no puffy cheeks, I googled "Australorp" and I think you are right. Her name is "Zebra" because she was black on top and light on the bottom when she was younger and looks a lot like the pics I googled