DescriptionA Visual Comparison of the Pelvis and Bony Birth Canal Vs. the Size of Infant Skull in Primate Species.png
English: The diagram compares the size and shape of the pelvis as the infant's skull must move through it for the Chimpanzee, Australopithecus afarensis and Homo sapien sapien. This comparison is one of the pieces of evidence physical anthropologists use as evidence supporting the Obstetrical Dilemma hypothesis.
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