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Nephews, Cousins . . . Who Cares? Detecting kin doesn't mean favoring them

New tests of the amazing nose power of Belding's ground squirrels have solved a 25-year-old puzzle about doing dangerous favors for relatives.

Classic studies beginning in 1977 showed that female Belding's ground squirrels sound alarms or defend burrows to help their mothers, sisters, or daughters. Yet cousins and extended family get no more assistance than strangers do.

Are the ground squirrels unable to tell who their cousins are? Or do they just not go to the trouble of aiding them?

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