White-nose syndrome has killed over 6 million North American bats. Understanding this devastating disease helps guide conservation responses that protect both bat populations and welfare.
White-nose syndrome causes profound welfare suffering in affected bats. The fungal infection disrupts hibernation, causing bats to arouse repeatedly during winter. Each arousal burns significant fat reserves, and bats that deplete reserves before insects emerge in spring slowly starve. Dying bats may leave hibernacula and be found unresponsive in winter conditions, unable to fly or feed. The scale of mortality — millions of individual sentient mammals — represents one of the largest single wildlife welfare disasters in North American history. Research into biological controls including probiotics applied to cave walls and UV light treatment shows promise. Cave closures during sensitive periods and strict decontamination protocols prevent human-mediated spread of the fungus.