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.

KISS AND TELL. Belding’s ground squirrels may look as if they’re kissing, but those few seconds of sniffing glands around the mouth reveal family relationships.