![]() Of all the great apes, bonobos are the most human-like in their leg length.Bonobos are quite similar in overall body size, cranial capacity, and lower limb length to an ancestral hominid, nicknamed Lucy, who lived some 3 million years ago in Africa.More body weight (heavier muscles) in lower legs of bonobos.More centrally positioned opening in skull for spinal cord (foramen magnum).Compared to chimpanzees, bonobos have body characteristics that are better for bipedal or upright posture: (Myers Thompson 2002).Bonobos have shorter upper limbs and longer lower limbs (Zihlmann 1996).In overall size, bonobos are not smaller than chimpanzees (most anatomical measurements overlap) but there are differences in proportion:. ![]() Nostrils are "thick-walled" and more gorilla-like.Lips are lighter, often reddish colored.Chimps' ears stand out more from the head.Ears smaller and almost completely covered by cheek whiskers.More slender build, narrower chest, bone and muscle of lower limbs is heavier.Head is more rounded, with smaller ridges above eyes, less developed muzzle, less jaw protrusion.Brow ridges and facial bone structure are less pronounced. ![]()
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