Add Yahoo as a preferred source to see more of our stories on Google. New research finds some small primates face birth canal constraints as severe as, or greater than, those seen in humans. (CREDIT: ...

Learn how 3D models of primate birth canals found that squirrel monkeys, bushbabies, and other small species may face a tighter squeeze than humans. A diagram drawn by a primatologist in the 1940s has ...

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 ...

According to a new study, chimpanzees, like humans, must contend with a confined bony birth canal when giving birth. In humans, the problem was exacerbated by our unique form of upright walking since ...

Scientists have long thought humans have a uniquely difficult birth compared with other primates. And it's true that, from an evolutionary perspective, we face an obstetrical dilemma. As we evolved to ...

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 ...

For decades, one idea has shaped discussions about human evolution and birth: humans endure unusually difficult childbirth because large-brained babies must pass through a relatively narrow pelvis ...

Add Yahoo as a preferred source to see more of our stories on Google. Human childbirth may not be unique, a new review finds similar birth risks across many mammals. (CREDIT: Shutterstock) Human birth ...