I've been trying to get my chicks used to being outside by taking them out for a few minutes and increasing the time every day. I always wait until the temperature is warm and move them to a chicken wired pen in the yard to watch them. However, every time I bring them out they act traumatized and get loose stool and just hunker down and act like they're sleeping. I can't get them interested in food, water, worms (which they usually love) or anything. I always end up bringing them in after ten minutes or so because it makes me nervous. What am I doing wrong?