Well,as the person above said, it may not be safe to hatch quail under chickens, BUT if you do, please remove the Quail as soon as you realize they are hatched. I believe that the best chicken breed for hatching other birds is the Silkie Bantams. They are very broody and are often used to hatch...
I live in Arizona, and I would like to purchase some Bobwhite or King Quail. But I don't really know if they are legal. Can someone help me please? Thanks in advance!:D