I went out to the coop this morning, and one of my girls was sitting on the floor. It seems as though she can't stand. I picked her up to check her out, and her left leg stays up against her body, and the talon seems curled up a bit. I set her back down and she sort of toppled over. I've only had chickens for a year and a bit, so I'm not very experienced, and I have never seen anything like this before. Do these sort of symptoms ring any bells for anyone?