White-nose syndrome has killed over 90% of bats in affected North American cave systems, causing mass suffering and population collapses with ecological consequences.
White-nose syndrome causes prolonged suffering in affected bats. The fungus disrupts hibernation physiology, triggering premature arousal from torpor during winter. Each arousal burns fat reserves needed to survive until spring insects emerge. Bats already weakened by disease face repeated arousal cycles, progressive starvation, dehydration, and death over weeks. The scale is extraordinary: millions of bats per year experiencing this slow deterioration in caves across the continent. The suffering is both individual and population-level — entire cave colonies have been eliminated. Emergency management responses including probiotic treatment, antifungal applications, and cave management to reduce transmission are providing hope for population recovery, but the welfare harm already inflicted and ongoing in unprotected populations is immense.