I hatched some eggs from a local woman who was selling them for eating. She had a Blue Orpington rooster and several different hens (Blue orpington, Lakenvelder, Rhode Island Red, White Leghorn, Ameraucanas, gold-laced Wyandottes, Lakenvelder were the ones I knew of). One of the eggs we incubated that hatched was a huge olive egg. The chick's down is grey with some yellow spots. Any idea, with the blue orp roo, which hen laid the olive egg?