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Polyandry is a marriage system where one woman is married to two or more men simultaneously. This practice is rare, though it has been documented in various societies globally, particularly in regions like the Tibetan Plateau and the Marquesas Islands. It can be a response to specific local conditions such as sex ratios, male mortality, or economic structures.1

In animal behavior, polyandry refers to a mating system where females mate with multiple males. This is less common than polygyny, where males mate with multiple females. The prevalence of polygyny is often attributed to the greater investment females make in producing large eggs compared to males' smaller, more mobile sperm.23

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