"Lots of animals," Quirk says, "have the 'marriage' instinct: penguins, parrots, swans, gibbons, seahorses, humans. ... What do all these animals have in common? Long childhoods. Who has the longest childhood in the animal kingdom? Humans."
clipped from www.alternet.org
For species whose slow-growing offspring statistically stand better chances of survival with two parents providing double-sustenance, double-vigilance, double-protection and double-support, monogamy makes scientific sense. But because it's so difficult "to live in the same nest for fifteen years," as Quirk puts it, "love is an instinct coded into our genes."
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