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  Not so fast, according to authors of the Science paper. Zoologists Dieter Lukas and Tim Clutton-Brock of the University of Cambridge examined the social structure of 2,545 species of mammals, of which 9 percent are socially monogamous. That was defined as a system in which a male mates with only one female and they "usually stay together until one dies," Lukas told reporters on Monday.
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