New study shows great variability in the shape of women’s birth canal across populations. Interpreted as further evidence against the “obstetrical dilemma” https://www.sciencemag.org/news/2018/10/birth-canals-are-different-all-over-world-countering-long-held-evolutionary-theory …
Just sounds like the obstetrical dilemma was solved in slightly different ways in different populations, given different baby head shapes & sizes?
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Doesn't there tend to be more variability in sexually-selected traits (such as hip width) than non-sexually selected traits?
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Thought so too. Have to dig into the full paper rather that the media write up.
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I have to admit I have never heard that the *shape * of the birth canal was selected for bc of the OD before this. But, I’ve also become convinced of the ‘energetic trade off’ hyp for birth timing in its placehttps://twitter.com/nicolebarbaro/status/1033036757045051392?s=21 …
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