In social monogamy, animals live together and form strong ties known as pair bonds, though sexual faithfulness is a separate question. Among mammals, humans are exceptions, as social monogamy has been observed in less than 10% of species—highlighting the rarity of such relationships in the animal kingdom.
The dynamics of parental investment greatly influence social monogamy. In most mammals, females bear the primary responsibility for offspring care, leading to a lower likelihood of stable pair bonding among males.
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