Humans have been placed 7th out of 35 mammal species in a new University of Cambridge study comparing levels of monogamy. The ranking was based on genetic data measuring how often siblings shared both parents — a sign of monogamous mating patterns. Humans showed 66% full siblings, putting us above animals like gibbons and meerkats, but below Eurasian beavers and moustached tamarins.
At the top sits the California deermouse, while promiscuous species such as chimpanzees, dolphins and mountain gorillas ranked near the bottom. Researchers note that human monogamy varies widely across cultures, and may have evolved to support paternal care and child survival.
Experts say that although humans often aspire to monogamy, social norms and personal desires mean relationships can be more complex — leaving us monogamous overall, just not quite as loyal as the beaver.
