THE THEORY OF EVOLUTION SUGGESTS THAT THE deepest drive of all living things is the urge to perpetuate their genes. How that's done varies widely from species to species. Take pilot whales, for example. While most guys living with relatives will leave home to find a mate, thus avoiding the genetic pitfalls of inbreeding, male pilot whales have found a reproductive strategy that better suits their oceangoing life-style. An analysis of the DNA of whale families, called pods, published in the journal Science, suggests that these young males wait until their pod collides with another, then mate with females they bump...
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