I took my fifteen Buff/Delaware peep girls, six weeks old, out to the coop for the second time. They love being in the big coop. I went out and checked on them every thirty min and all was fine , till I found two of the chicks dead. It is completely closed in. I most likely will never know why they died. I already have them trained to come to me when I call, "Chick Chick" so when they go out to range I won't have a problem getting them back in when I want the in. To bring them in the house now, I put oats on a paper plate and set it in a box. I yell Chick Chick. They run in to eat and I turn the box upright and bring them back into the brooder. I've raised birds for many a year and still feel bad when I lose one.