The Evolution of Upright Walking in Humans and Lucy.
New research has used digital polygonal muscle modeling to reconstruct the soft tissue composition of Lucy, the most famous early human ancestor, and shed light on the evolution of bipedalism. The study found that Lucy and her species, Australopithecus Afarensis, walked upright with an erect position of the knee, similar to humans today. However, Lucy likely had a range of movement types that humans today are not capable of, and her muscles suggest she was as proficient at bipedalism as humans while also being at home in the trees.