When we think of "exclusive" relationships in nature, the mind often wanders to the poetic image of two swans gliding across a lake or a pair of penguins huddling against the Antarctic cold. For a long time, we viewed animal social lives through a human lens—either they were "monogamous" like us (or so we hoped) or they were driven by purely primal, solitary instincts.

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This topic bridges evolutionary biology animal behavior . While roughly 90% of bird species are socially monogamous, only about exhibit this behavior