I brought home a hen and 21 chicks, almost 2 weeks ago. I don't know if any of the chicks are from the hen, an Isbar hen. I was told there were 25 hens the chicks could have come from. Anyways, this hen was particularly broody, and decided to hatch all 21. I don't even understand the logistics of that feat. She has been an amazing mother to them all. I can't believe she has not gone crazy by this point. They are 3 1/2 weeks old, and they still sleep under her, and some on top of her. I should add that, as of yesterday, there are only 19 left. One died from food stuck in its throat, and one just totally disappeared. I let her free range with them a few hours a day. I have read about hens turning on their chicks, due to stress. Is there anything I should look out for? She is happiest when she can free range. I can see her giving me the evil eye as I type, as she is held up in the run. I don't like her out with the chicks when I am not around.