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In page Molecular ecology:

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While most bird species are socially monogamous, molecular data has revealed that less than 25% of these species are genetically monogamous.[1] EPFs complicate matters, especially for male individuals, because it does not make sense for an individual to care for offspring that are not their own. Studies have found that males will adjust their parental care in response to changes in their paternity.[2][3] Other studies have shown that in socially monogamous species, some individuals will employ an alternative strategy to be reproductively successful since a social bond does not always equal reproductive success.[4][5]