Chick With Genetic Defect
Polymelia is a disease in chickens that causes one of their limbs to be extra. When a chick is born with an additional limb or more, it deviates from the typical two-legged bird nature. Because of this flaw, there usually isn’t any serious outcome. Their development may be considered average for other birds.
Polymelia can be caused by a variety of factors, including pollution, the environment, and genetic abnormalities. In 2005, another case in Pennsylvania made headlines when a chicken produced with four legs was born. The chick grew up properly and had normal abilities even though the extra legs were non-functional at eighteen months old.