> So how did this evolve over the past 1000 years? The article says "For more than 1,000 years". That doesn't mean that whatever features these people have hav

> So how did this evolve over the past 1000 years? The article says "For more than 1,000 years". That doesn't mean that whatever features these people have have evolved in that time period, but that they ran into the limits of recorded history. Humans have been in that area for around 50,000 years. It's entirely possible that the current tribe derives from some subset of the population that's been doing this sort of thing for much longer than a millennium. > Selection pressure? Maybe, but one thing you and the other replies haven't touched upon is the possibility of selection bias. These people aren't in isolated population on some island in the middle of nowhere. They've been living around other humans for their entire existence. So it's possible that this population today isn't just the result of selection pressure, but selection bias. People who were good at hunting underwater due to their genetic aptitude would have found and joined the tribe, who were happy to let them in as they were good at underwater hunting and could pull their weight. Conversely, those in the tribe who weren't good at it might have left the tribe entirely.