Social tuco-tucos develop more variety

From Atlanta, Ga., at the annual meeting of the Animal Behavior Society

In mustachioed rodents called tuco-tucos, nature has set up a tidy test for the effect of social life on the immune system.

Group life boosts exposure to pathogens, explains Eileen A. Lacey of the University of California, Berkeley. Evolutionarily, that added exposure ought to be associated with more genetic variety in immune systems than solitary lifestyles show.