Geographic variation in the human birth canal and its implications for the ‘obstetrical dilemma’ theory

The human birth canal is just large enough for the newborn, making childbirth a difficult and often dangerous process. In a recent study published in the Royal Society, Lia Betti (University of Roehampton) and Andrea Manica (University of Cambridge) show that there is substantial variation in the shape of the female pelvis across human populations, and that most Read More…