Consumption of shed feathers is normal, especially among immature chickens. In confinement the consumption can extend to feathers not ready to be shed (feather picking) and even new feathers. Carried far enough and you can have chickens running about more than half naked. In extreme cases is can lead to actual consumption of flesh and death of the consumed individual. I am rearing several batches of 30+ chicks and feather picking is becoming an issue. Space is part of the problem for some batches but a couple it is not. Where the problem is apparent, the chicks have very little to do. A lot of hay has been placed up against walls of pens where chicks have began pecking heavily on that. We shall see if it stops feather picking and / or prevents it from starting in younger batches.