Measurements of the length of the hindlimb bones indicated that the tibiotarsus is invariably the largest among the three major leg bones.

• 即在所有鸟类的后肢骨骼中，胫跗骨的长度占3块骨骼的比例为最大；地栖鸟类后肢骨骼中股骨的长度要短于跗跖骨；