Im not sure what is going on with my 3 yo black star hen. I just went out to give the girls some mealworm treats and she is dragging her tail and vent area along the ground. looks like a dog sitting. otherwise she is acting perfectly normal. she was gobbling up mealworms per norm so her appetite not affected. what would make a hen assume and maintain this strange posture. we have no rooster in our flock and she laid her normal egg yesterday