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February 24, 2012
A mother's loss
A new U-M study indicates that pregnant female geladas (Old World monkeys closely related to baboons) show an unusually high rate of miscarriage when the dominant male in their group is replaced by a new male. The "Bruce effect," as it's known, has been found repeatedly in laboratory rodents, but this was the first time it had been seen in a wild population.
Photo: Clay Wilton