This pen derived from the "mysterious light green" egg layers that came out of some of the original GFF imported rhodebars. Many people culled them and removed them from their breeding program. But, I ended up purchasing them from someone so I could try to reproduce a visually looking rhodebar that lay a colored egg. Another autosexing breed with unique egg color? That's a win for me. These will hatch chicks that are sexable and visually identical to rhodebars that can lay an olive, light green/blue, or occasionally a tan colored egg.