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• W2915416997 abstract "The narrow human birth canal evolved in response to multiple opposing selective forces on the pelvis. These factors cannot be sufficiently disentangled in humans because of the limited range of relevant variation. Here, we outline a comparative strategy to study the evolution of human childbirth and to test existing hypotheses in primates and other mammals.We combined a literature review with comparative analyses of neonatal and female body and brain mass, using three existing datasets. We also present images of bony pelves of a diverse sample of taxa.Bats, certain non-human primates, seals, and most ungulates, including whales, have much larger relative neonatal masses than humans, and they all differ in their anatomical adaptations for childbirth. Bats, as a group, are particularly interesting in this context as they give birth to the relatively largest neonates, and their pelvis is highly dimorphic: Whereas males have a fused symphysis, a ligament bridges a large pubic gap in females. The resulting strong demands on the widened and vulnerable pelvic floor likely are relaxed by roosting head-down.Parturition has constituted a strong selective force in many non-human placentals. We illustrated how the demands on pelvic morphology resulting from locomotion, pelvic floor stability, childbirth, and perhaps also erectile function in males have been traded off differently in mammals, depending on their locomotion and environment. Exploiting the power of a comparative approach, we present new hypotheses and research directions for resolving the obstetric conundrum in humans." @default.
• W2915416997 created "2019-03-02" @default.
• W2915416997 creator A5013577660 @default.
• W2915416997 creator A5026877517 @default.
• W2915416997 creator A5032652974 @default.
• W2915416997 creator A5067229143 @default.
• W2915416997 creator A5068847496 @default.
• W2915416997 creator A5088220407 @default.
• W2915416997 date "2019-02-27" @default.
• W2915416997 modified "2023-10-16" @default.
• W2915416997 title "Humans as inverted bats: A comparative approach to the obstetric conundrum" @default.
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