White-nose syndrome has killed over 90% of some North American bat species since 2006. The mass mortality event represents both a conservation emergency and a massive welfare concern.
White-nose syndrome is one of the most dramatic wildlife disease events in recorded history, and its welfare dimensions are substantial. Bats dying from WNS experience a prolonged, distressing death: the fungal infection disrupts their torpor, causing them to arouse repeatedly during winter when no food is available, depleting fat reserves until they starve. Affected bats emerge in midwinter, visibly weakened and disoriented, to die from cold and starvation. The scale of individual suffering across millions of animals makes WNS a significant welfare event, not merely a conservation problem. Research into treatments — probiotics, UV-C light exposure, vaccine development — addresses both the conservation and welfare dimensions simultaneously. Bat-friendly land management, minimizing disturbance to hibernation sites, and monitoring programs help support remaining populations.