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Bornean orangutans are less social than Sumatran orangutans. This variation in sociality directly influences the extent to which male orangutans can monopolize reproductive success. This male reproductive skew has different impacts on genetic diversity on the X chromosome compared to the autosomes, leaving a genomic record of male reproductive behavior. Our research uses analysis of published genomes from Bornean and Sumatran orangutans to compare ratios of genetic diversity between the species.