Bison Wallowing Summary Bison wallowing is a natural dust-bathing behavior where the animals roll in dry dirt or mud to support their health, comfort, and social life. * Parasite Defense: Dirt coats the hide to repel ticks, lice, and biting insects. * Coat Shedding: Physical friction helps strip away loose, matted patches of winter hair. * Temperature Control: Acts as natural sun protection and cooling insulation against summer heat.