Research using DNA analysis has shown that, with most bird species, the eggs within a nest being incubated at the same time may be the product of a single female and more than one male. This is finding is evidence of

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The finding that eggs within a nest being incubated at the same time may be the product of a single female and more than one male suggests that there has been extra-pair copulation, meaning that the female has mated with multiple males outside of her primary mating partner. Polygyny refers to a male having multiple female mates, while polyandry refers to a female having multiple male mates. Promiscuity refers to individuals having multiple sexual partners without a strong preference or commitment to any one partner. While the finding of multiple males fathering eggs in the same nest does suggest promiscuous behaviors, the specific term for this behavior is extra-pair copulation.

Research Using DNA Analysis Has Shown That, with Most Bird