Body odor. To some it’s an embarrassing nuisance. But to meerkats, it’s a calling card. Meerkats produce a pungent ‘paste’ that they use to mark their turf. With one whiff they can tell if a scent belongs to a relative, a rival or a potential mate. But the chemical signals in this stinky graffiti don’t come from the meerkats themselves; they’re made by odor-producing bacteria that thrive in the meerkats’ gooey secretions, researchers find.