I have 2 pure bred Blue Wheaten Ameraucanas that are approximately 6 weeks old. When I got them, they were about 2 weeks old, and looked almost identical, but now they have a few differences. Here's the first one. It has noticeably longer tail feathers, and is getting some darker brown feathers on the wings. It's comb is pretty much all yellow. Here's the second one. Coloring seems a bit lighter, but much more gray on the head. Also, the tail feathers are shorter, and comb looks like it's pretty red. Hoping for 2 pullets, because I won't be able to keep a rooster in my neighborhood.