my hen can barely walk. Can't see anything wrong with her visually. She has good grasp with her claws but takes few steps then falls. She is very skinny. She tried to eat today. Is it possible the rooster ( both 4 months old January 14th.) may have hurt her. He seems to be rough with the hens. On Ms Chicky's last day she could only lay there and barely flap one wing. Sounds terrible! She died that day. I'm afraid it was Merks disease & will vaccinate baby chick from now on. I never get any other chicks except day old chicks. They must be vaccinated before arriving on our place.