When I got the chicks I ordered, there was an extra one with them. One was completely gray and one was gray with a little yellow (mostly on her head). One of them is definitely a White Plymouth Rock, since that is what I ordered. I thought the other one might be a second White Plymouth Rock, but now that they are 2 weeks old I am not so sure anymore. Chick 1 is what I believe the White Plymouth Rock. Her wing feathers are coming in nicely and are completely white. Chick 2 at 1 week old. Still completely Grey/Silver. Chick 2 at 2 weeks old. Her feathers that are coming in are a silverish or grayish white with darker gray lines or spots in them. This leads me to believe she can't be a White Plymouth Rock. Any thoughts as to what breed she could be?