The reason why the giant panda walks in figure 8 is because of its special hip and pelvis structure, and the gap between femur and acetabulum is wider than other animals to adapt to the influence of cellulose food such as bamboo on digestive system. This special pelvic structure causes the thigh bone of the panda to move closer to the center, so it can only walk in the form of an internal figure of eight, which is one of the unique characteristics of the panda.
In addition to pandas, other animals, such as polar bears and Siberian tigers, walk in similar postures, which is also related to their pelvic structure.