The sanctuary hens are a designed breed. These chickens have been specifically designed to lay almost daily for 18 months and then to die. They’re descended from the Red Jungle fowl, a bird native to the Amazon and which lay two to three eggs per month, usually in clutches. However, these derivatives have been designed to lay an egg virtually every day. Laying and egg isn’t an act in itself, but is the end of the reproductive cycle, which means that egg-laying hens are forced into a full reproductive cycle almost every day of their lives.