@pavellimRoughly 1% of the world's population carries natural blonde hair paired with blue eyes, and that combination is about as rare as physical traits get. Geography does most of the explaining: it shows up mainly in Northern Europe and among people whose families came from there, and beyond that spread it's essentially nowhere. The numbers on the other side are what make this a story rather than trivia. Europe's birth rate sits around 1.4 children per woman, while holding a population steady needs 2.1. Follow the trend out and the phenotype thins with each generation, which is the whole argument here: this isn't 'just light-haired,' it's an endangered genetic type, and a Red Book listing would already be appropriate.

@pavellimRoughly 1% of the world's population carries natural blonde hair paired with blue eyes, and that combination is about as rare as physical traits get. Geography does most of the explaining: it shows up mainly in Northern Europe and among people whose families came from there, and beyond that spread it's essentially nowhere. The numbers on the other side are what make this a story rather than trivia. Europe's birth rate sits around 1.4 children per woman, while holding a population steady needs 2.1. Follow the trend out and the phenotype thins with each generation, which is the whole argument here: this isn't 'just light-haired,' it's an endangered genetic type, and a Red Book listing would already be appropriate.