My big fat mixed Australorp hen showed no signs of being unhealthy. She has been eating fine and growing like a weed. When I went out to the coop this morning, she was dead on the floor. The only thing different is let them out in the yard for the first time yesterday. I had to catch some of them with a big net to get them back in the coop. She was one of those. I hope I didn't hurt her. She didnt seem to be hurt and was sitting on egg that evening. Now I'm afraid she had a disease and my others will get sick. Im new to this......help!!