I have a variety in my flock, some are pure but quite a few are EEs and/or surprise mix breeds. I've noticed the ones that lay blue, green or olive eggs also tend to have leg skin colors of grey, almost blue. Some of mine with the dark leg skin color also have laid dark brown eggs, but I've never had a yellow leg skin color hen lay a blue, green or olive egg. I also have 1 EE with a head tuft that lays light brown eggs, so can't always go by the head tuft either. It's really cool to be able to offer a dozen eggs with about 12 different shades ranging from...Ivory, lightest brown, medium brown, darkest brown, pale blue, medium blue, greenish blue, sage green, olive green, white & occasional pinkish or plum or speckled colors.
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In Pic #8 there is an orange-ish rooster ... what is he, what breed, do you know? He looks very much like my Rojo, but Rojo has a rose comb. I think mine is probably a BYX but don't know as he was given to me.