I have three chickens, purchased at the same time, all now six months. The Barred Rock and Americauna have been laying for two months nearly everyday. The Golden Wyandotte has never layed. She's never showed any interest in the nesting box. They do free range some everyday, but only when I'm home, and I've never seen her nesting elsewhere either. She's the same size as the others and eating and acting the same, just no eggs. Thoughts?