One of my new flock of 15 has huge feet and thick legs. She is a leghorn and when i got her i assumed she was just a week older than the other tiny chicks i bought. She grew much faster than the others and when the other chicks still had pleanty of headroom in the brooder she had to bend down. Her feet and legs are huge. I've had the chickens for 13 weeks now and she hardly moves. She CAN fly down froom the house to the run but lately stays in the house. Her legs have always seemed very very weak. Any help or answers? She is twice the size of the other chickens.