Human childbirth is not uniquely difficult relative to other mammals
Human birth has a reputation for danger. The usual explanation is simple enough: walking upright narrowed the pelvis, while evolution also favored babies with large brains, leaving little room for error during delivery. That idea has shaped how many scientists and non-scientists think about childbirth for decades. But a new review from the University of Vienna argues that the picture is too human-centered. Across the mammal family tree, difficult labor appears far more common than many people have assumed, turning up not just in livestock and pets, but in wild deer, seals, whales, primates, and elephants. The broader message is unsettling and clarifying at once. Human childbirth is risky, but it may not be uniquely risky. Instead, the research suggests that difficult birth is part of a wider mammalian pattern, one rooted in trade-offs that evolution has not been able to erase. Zebra foals are relatively large at birth and can stand within minutes and follow the herd within an hour. (CREDIT: Frank E. Zachos) Birth trouble is scattered across the mammal world The old …
