Evolutionary biology: Mating for life

Even birds do it.¬†We learned from evolutionary biology that with birds, thought to be monogamous, females do flit about looking for the best genes. I was surprised years ago, in doing research for a case where neither the husband nor the boyfriend was the father of my client’s child, to find a great number of such cases among humans.

Now EarthWeek tells us that a pair of swans, which typically mate for life, have apparently gotten a divorce! At the Wildfowl and Wetlands Trust Center at Slimbridge in southwest England, a pair of Bwick’s swans, previously paired with each other, have appeared with new partners. This is the second such re-pairing in over 40 years at that center. We will assume they had an empty nest.

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