Ideas on my "mystery" chick?

[cindyanne1]

I received six "assorted brown egg layers" from My Pet Chicken. I've identified four of them (two RIR's, one Australorp and one barred rock) but two of them I can't figure out.

They were yellow as chicks, and their feathers came in white. Now that they are about a month old, they are showing some black feathers coming in too... giving them a streaked appearance but still mostly white. They have single combs and yellow legs, and we know they're going to lay brown eggs.

I couldn't take great pictures, but here's a few:

Any ideas?

 

[danielbrown]

Columbian rock or Delaware.

 

[GardeNerd]

Yeah, I was going to guess Deleware, too, but I have never seen any at 4 weeks old.

 

[Shkittles]

I say Delaware also.