A few days ago my friend had got a very pleasant surprise -- a bantam hen that had gone missing returned with FOURTEEN new baby chicks! She thought some critter had gotten this hen, instead she had been hiding out in the woods brooding this clutch. My friend secured them all in a pen to keep them safe from the Raccoon Mafia that rules their neighborhood. However, she found 2 or 3 chicks dead one evening, with mortal peck wounds on the sides of their heads. This hen & her chicks are the only birds in this pen, no other chickens share it. What would make a Mama hen do something like this? Is there a way to prevent it from happening again, or should they just let Nature take its course? My friend & I, and the chicks, appreciate your imput. Thank you.