I lost my first chicken today. Let them out of the run this morning and left for a short time. When I came back, I didn't see any of them. I checked the coop and saw most of them inside, and then noticed 4 under a bush that ran toward me when they saw me. Then, on the outside of the run, I noticed the dead hen. I checked her out and it looks like her head was missing and there was a gash in her side. Feathers everywhere. I buried her. She was under some trees behind the coop. Am I right to guess it was a hawk? They seemed to be hiding from something above, and the feathers are consistent with what I have seen when hawks attack doves. Maybe the hen was too heavy? She was about 11 weeks old. Is that too early to let them out, or can I never do so?