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Men with deep-pitched voices are more fertile and father more children, according to a study at Harvard University, US. The study was based on the reproductive patterns of a Tanzanian hunter tribe called Hazda that continues to live pretty much the same way that human beings did 200,000 years ago. The Hazda tribe females collect berries and males hunt animals.

“We don’t know the exact reason that these men with deeper voices have fathered more children. It may be that they have increased access to mates, begin reproducing at an early age or their wives have shorter inter-birth intervals because they provide more food to them,” said researcher Coren Apicella.

Apecilla collected voice recordings from 49 men and 52 women between the ages of 18 and 55 in nine different Hazda camps. Participants were asked to provide the names of their children, and their voices saying the Swahili word for “hello” into a microphone was recorded. These vocal recordings were analyzed for frequency. The researchers found that age matched males with lower vocal pitch had fathered more children.