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“Sex ratios” as a book category encompasses works that investigate the balance of males and females in populations—how it is measured (at birth, adult, and operational sex ratios), why it varies, and what those variations imply. Spanning biology, evolution, ecology, demography, sociology, economics, and public policy, these books explore mechanisms of sex determination, Fisher’s principle and parental investment, as well as human factors such as fertility, mortality, migration, son preference, and reproductive technologies. Authors analyze consequences of skewed ratios for families and communities—affecting marriage markets, caregiving, labor and health systems, crime, politics, and social stability—using historical cases and contemporary examples (e.g., policy shifts and rapid economic change). The category also includes wildlife and conservation studies where sex ratios shape population viability, alongside methodological work in statistics and field research. Many titles engage ethical debates and policy interventions aimed at promoting equity and sustainable population dynamics.

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