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What happens when birds 'divorce'?

Birds are often lauded for their monogamous tendencies. Forming pair bonds, many species share the division of labor quite equally and some even mate for life. But sometimes things do go wrong and the birds divorce. New Scientist reports that when great tits part ways, it’s the females that benefit from the split through improved future breeding success. The males, on the other hand, show no improvement and sometimes lose territory in the process. Because of the risks for males, researchers suspect that it’s the females that cut things off, maybe even laying fewer eggs on purpose to give the impression that things aren’t working out.