To see what lemur pregnancy smells like, Duke University's Christine Drea and Jeremy Chase Crawford, from the University of California, Berkeley, swabbed 12 lady lemurs' nether bits both prior to and during pregnancy.
These swabs revealed that a male baby was linked to a less complex bouquet, the scientists reported Wednesday in the journal Biology Letters. This marks the first time a sex-linked scent difference in pregnant animals has ever been found, the authors say.
Sex differences were reflected in the expectant moms' hormones, too. "The difference in hormone profiles between pregnant lemurs carrying sons and those carrying daughters is dramatic," Drea said in a press release.