One of my 3 year old Delawares is walking very stiff legged. She raises one leg and puts it right in front of the other, and so on. She is eating, drinking, socializing, bug eating, scratching, and otherwise looks fine. Tends to walk a little slow, but otherwise seems normal behavior. I have searched the "stiff leg" threads and do not find cause or solutions for hens. Seems to be a problem with roosters and chicks. What am I missing?