Which led to the demise of Neanderthals.
From the Telegraph:
Rather than being outwitted by the more numerous early humans, Neanderthals were just as sophisticated -- but so impressed the humans they were seen as potential mates, say scientists.
The interbreeding meant that their own line died out, said Professor Julien Riel-Salvatore, of the University of Colorado, adding: "In many ways they were simply victims of their own success."
Researchers studied computer models of how hominin groups evolved in response to climate change in the last Ice Age, looking at culture and biology amongst hunter gatherers between 11,500 and 128,000 years ago, reports journal Human Ecology.
Professor Michael Barton, of Arizona State University, the lead author of the study, said: "We designed theoretical and methodological frameworks that incorporated feedback across three evolutionary systems: biological, cultural and environmental.
"One scientifically interesting result of this research, which studied culturally and environmentally driven changes in land-use behaviors, is that it shows how Neanderthals could have disappeared not because they were somehow less fit than all other hominins who existed during the last glaciation, but because they were as behaviorally sophisticated as modern humans."An amusing tale. But given the history of the world -- of invaders from overpopulated territories pushing out the indigenous people -- this scenario is plausible.