Wild Bat Conservation and Welfare: White-nose Syndrome and Roost Protection

Bats are the most species-rich group of mammals after rodents, yet face multiple significant threats including white-nose syndrome, wind turbine strikes, roost disturbance, and pesticide-driven prey decline. Their welfare and conservation deserve far more attention than they typically receive.

Key Facts

There are over 1,400 bat species globally, comprising approximately 20% of all mammal species; they occupy every continent except Antarctica and perform critical ecological services including insect pest control and pollination
White-nose syndrome (WNS), caused by the fungus Pseudogymnoascus destructans, has killed an estimated 5.7-6.7 million bats in North America since 2006 — one of the most catastrophic wildlife disease events in recorded history
WNS causes bats to arouse repeatedly during hibernation, depleting fat reserves; affected bats become active in winter, fly in daylight, and die of starvation — a prolonged and distressing welfare and population emergency
Wind turbines kill an estimated 600,000-900,000 bats annually in the US, primarily through barotrauma from pressure differentials near blades rather than direct blade strikes; simple deterrent systems (acoustic deterrents, feathering blades at low wind speeds) reduce mortality significantly
Roost disturbance during maternity season — when females gather to give birth and raise pups — causes pup abandonment and mortality; bats are protected during this period in most European countries but enforcement is inconsistent
Agricultural insecticide use reduces the insect prey that bats depend on; studies show bats in agricultural landscapes have reduced foraging success and condition compared to those in diverse landscapes
Bats are highly intelligent, have complex social structures, and some species show lifespans of 40+ years — making population recovery from catastrophic events very slow given low reproductive rates (usually one pup per year)
Recovery treatments for WNS are in active development: probiotic bacteria applied to hibernating bats and vaccine approaches have shown promise in trials

Welfare Considerations

The welfare of individual bats affected by white-nose syndrome involves a prolonged dying process: arousal from hibernation depletes fat reserves, bats emerge in winter unable to find insect prey, and die of starvation and cold over days. This is not quick death but a drawn-out welfare emergency experienced by millions of individual animals across thousands of cave hibernacula. Wind turbine barotrauma causes acute internal haemorrhage — the pressure wave as a bat passes near a blade tip causes lung and other internal organ damage without requiring direct contact. These are real, individual welfare harms that occur at enormous scale in species that are poorly understood by most members of the public. Bats also face the welfare challenge of roost disturbance during their most vulnerable period: maternity colony disturbance causes nursing females to abandon pups who then die of starvation and cold. Protection of roost sites and sensitisation of building renovation contractors to legal and welfare obligations is a concrete intervention that local bat groups provide across many countries.

What You Can Do

Support Bat Conservation International, Bat Conservation Trust (UK), and national bat conservation organisations financially and as a volunteer — these provide expertise, roost monitoring, and WNS research
If you discover a bat roost during building renovation, stop work and contact your national bat helpline before proceeding — disturbing a roost during maternity season is illegal in most European countries and causes direct welfare harm
Reduce insecticide use in your garden and advocate for agricultural pesticide reduction — insect-rich environments support healthy bat foraging and help bats maintain condition for winter hibernation
Support wind industry commitments to implement bat deterrent systems and smart curtailment (shutting turbines at low wind speed during high bat activity periods) — these measures significantly reduce mortality at modest cost
Install bat boxes in gardens and on buildings — artificial roost sites supplement natural roost availability and are easily installed with lasting benefit
Participate in citizen bat monitoring schemes (National Bat Monitoring Programme UK, BatWatch USA) — bat detector surveys provide population data that guides conservation priority-setting