DNA Shows It: Birds Are Promiscuous

Here's the warm and fuzzy part of this column: most birds really do mate for life. But here's the cold side: They mess around. And here's the switch: Blame the ladies. Ever since Charles Darwin postulated it would be to a bird's evolutionary advantage to stick with the same mate for its entire life, poets and novelists and even scientists have thought that meant they would remain faithful to the same mate, both sexually and socially. But that sweet song began to sour a few years ago when...Full Story
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