White-nose syndrome has killed more than 6.7 million bats in North America. Understanding this devastating wildlife disease helps identify effective welfare-protective actions.
White-nose syndrome causes welfare harm through a specific mechanism: the fungus growing on bat skin during hibernation triggers an immune response that arouses bats from torpor. Each arousal burns weeks of fat reserves. Bats that arouse too frequently before spring emerges, when food is available, starve. The suffering of mass starvation across millions of individuals represents one of the most significant wildlife welfare events in North American history. The disease continues spreading westward, now reaching areas with naive populations that have no prior exposure. Probiotic research — developing bacterial strains that inhibit fungal growth on bat skin — offers the most promising treatment pathway. Decontamination of equipment used in caves reduces human-mediated spread between cave systems.