Research suggests mating direction bias between Neanderthals and humans

Scientists say DNA evidence indicates male Neanderthals and human females interbred more often than opposite

Tens of thousands of years ago, as modern humans migrated into northerly territories inhabited by our ancient cousins, the Neanderthals, the two species met - and sometimes mated.

Now, genetic evidence has revealed a striking imbalance in these prehistoric trysts, suggesting that interbreeding was mostly between male Neanderthals and female humans.