Bat Conservation and Welfare: White-Nose Syndrome

White-nose syndrome, caused by the fungus Pseudogymnoascus destructans, has killed millions of North American bats. Conservation and treatment efforts raise welfare considerations for individual bats.

Key Facts

White-nose syndrome has killed an estimated 6-7 million bats in North America since its discovery in 2006.
The fungus grows on bats during hibernation, causing metabolic disruption and starvation through increased waking frequency.
Some bat species have declined by 90-99% in affected regions — the little brown bat was once among the most common North American mammals.
Bats are critical for insect pest control — a single bat can eat 1,000 insects per hour — making their decline an ecological welfare concern.
Probiotic treatments applied to bat colonies show promise in reducing WNS mortality without the welfare costs of individual treatment.

Welfare Considerations

White-nose syndrome represents wildlife disease management at its most urgent. The welfare harm to individual bats — dying slowly from metabolic exhaustion during what should be restful hibernation — is compounded by the ecological cascade as insect populations explode without their primary predators. Conservation interventions must balance the welfare costs of treatment (handling stress, probiotic application) against the welfare benefit (preventing disease mortality). Probiotic and UV light treatments that can be applied to cave surfaces without individual animal contact are among the most welfare-friendly options under investigation.

What You Can Do

Support Bat Conservation International and White-nose Syndrome response programs.
Never enter caves during bat hibernation season — WNS spreads on clothing and equipment.
Install bat boxes in your garden to provide summer roost sites for local bat populations.
Advocate for funding of WNS research and treatment development.