Belding's ground squirrels live underground in colonies where adult females are closely related (kin).
A squirrel may give a loud call to alarm its nest mates when it sees a predator.
Making alarm calls is dangerous: about half the time the caller is killed by the predator, but this may save its kin.
Close relatives share many genes, so kin selection may explain such altruistic behavior:
ground squirrel alarm call