Baby BO: Smell Alone Can Reveal the Gender of an Unborn Lemur

It's an iconic image: a wrinkled great-grandmother hovering over a swollen belly while she dangles a needle on thread. "It's a boy" or "it's a girl," she'd proclaim without any real idea of what she's talking about. Scientists have long argued that there is no sure-fire way to determine an unborn child's gender. Even ultrasound can get it wrong. For lemurs, however, all it might take is a sniff of strong motherly BO.