After a bit of a rough start, the chickens are thriving. First we had the incident with the older birds pecking the younger ones. We segregated the little ones into an old doghouse. They are well, and then one of the cats got through two layers of fence to grab one of the birds, injuring the chicken slightly. We brought both little ones in and warmed them up in a box with a light attached, and they are now happy and health. We have added another layer of protection to the sides, especially to keep the cats at bay. They are still interested, but can't get at the birds.