Where do the gender differences in the human pelvis come from?

Photo of a female human pelvis and skull of a newborn baby. Barbara Fischer) - A comparison with chimpanzees provides surprising insights The pelvis is the part of the human skeleton with the largest differences between females and males. The female birth canal is on average more spacious and exhibits shape features that enable birth of a large baby with a big brain. In forensics, these pelvic differences are used for sex identification of human skeletons. Thus far it was unclear when these pelvic differences first appeared in human evolution. Barbara Fischer from the University of Vienna and her coauthors have published a study in Nature Ecology & Evolution presenting new insights into the evolutionary origin of pelvic sex differences. Fossil remains of the human pelvis are rare because the pelvic bones do not preserve very well.