My husband thinks we have white leghorn chickens. They were yellow chicks when we got them and their feathers came in very white. They are only about 7 months old and their heads are now turning a biscuit color and some of the feathers around their wings are doing the same. They also don't lay white eggs. They lay brown with white speckles. I think it may be a cross breed? I'm not sure. I'll attach some pictures in a few minutes. Thanks!