Evolutionary Variation
In the orangutan, an Asian arboreal brachiator who uses all four limbs to move about, the head of the femur is completely spherical and the head-acetabulum ligament is absent, which allows for a greater range of motion. In African apes, such as bonobos, chimpanzees, and gorillas who move mainly by terrestrial knuckle-walking, this ligament is present.
Read more about this topic: Ligament Of Head Of Femur
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