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important grandmas like her, really are. here s john berman. reporter: you can never go wrong with the idea that grandma knows best. especially when grandma weighs more than 5,000 pounds. we ve long known that in the majestic world of elephants it s the matriarch who guides the herds but now we know how skilled they are at leading. in a new study researchers tested an african elephant herd s reaction to different lion roars. lions are an elephant s most dangerous wild predators, with male lions being the most dangerous. when scientists blasted the sound of a male lion s roar, not a female s, it was the oldest elephant, a 66-year-old named joyce, who could best detect the danger. and herd the other elephant into a tight-protected group which increases their chance of survival. grandma led the way. scientists say it s older female s vast life experience that gives them these skills. plus, since they re too told bear children anymore, they pay

John bermanLion roarsStudy researchersAfrican elephant herdThe sound ofa male lions roarUp to virginiaGrandma elsieLife experience