Thank you for your comments, good suggestions. My chickens will come when I call them. They think I have something for them or they are just curious. Yesterday it started to get above freezing and the ice started melting off the trees, fences and grass, etc., so I wasn't afraid they would hurt their feet so I went to their house and pen. As I was walking there I could here the ice falling from the trees on the metal roof of their house. Not just one clang but over and over again. When I got there I started calling for them and for a long time they wouldn't come out. Then just about the time I was ready to give up My rooster came out but very slowly and then the only old Java mother hen (or I should say grandmother) followed but the younger ones less than a year old didn't come out. I surmised that the noise of the ice falling scared them enough that they wanted to stay inside.