I have just gotten new chicks that hatched about 3 weeks ago and I have one chick that is not the smallest or any different from the others but just won't interact with the others. She just sits in the corner of the cage while the other chicks are interacting and having fun with each other. They are all running around as she is just sitting alone in the corner of the cage. It is worrying me because she is also constantly sleeping it seems. I took them outside today because it was a beautiful, sunny, with 70 degree weather and while all of the chicks bounced out of the cage the one chick wouldn't come out and even when I did her her to come out she sat by me and wouldn't leave. Is she depressed? May she be sick? What's going on with her?