Wow, got home @ 5:30 today and 2 dead chicks in their pen. Due to the warm weather here I had 5 chicks in an outside pen with plenty of room, grass,dirt,water and starter feed. I saw the chicks at 1:00 and all were fine, but @ 5:30, two were stiff with their necks pecked open. I have seen alot of advice about letting them play, but this is proof, they will kill each other if they draw blood. I searched the pen and adjoining area with no signs of a predator. Just feathers and blood in the pen.