Wisconsin Bat Populations Make a Strong Comeback

Quick Smiles:

• Bats in Wisconsin are showing steady population growth after disease setbacks.
• Citizen scientist surveys reveal increasing numbers for three years straight.
• Conservation efforts and natural behaviors help bats reduce fungal infections.

Bat populations in Wisconsin are making an inspiring rebound after years of struggle with white-nose syndrome. The state’s little brown, big brown, tricolored, and northern long-eared bats are being counted in higher numbers each year, thanks to dedicated surveys by volunteers and scientists.

The fungus responsible for white-nose syndrome arrived from Europe and was especially devastating to cave-roosting bats east of the Rockies. These bats spend winters huddled together in cool caves, which helps them stay warm but also increases their risk of spreading the fungus.

Bats are exceptional insect hunters and pollinators, playing an essential role in both wild and urban ecosystems. Their presence helps control mosquitoes and benefits many plants.

According to a 2024 report, two of the state’s largest bat roosts showed population increases in 2023 and 2024. Two months ago, the Wisconsin Department of Natural Resources observed more than 25,000 bats during their annual survey—an impressive increase of over a thousand since last year.

“Bats in Wisconsin that are surviving with White Nose Syndrome are doing things to reduce the amount of fungus on their body.”

Even though bats often face misconceptions and are slow to recover from big losses, experts highlight their importance to human and animal health alike. Bat colonies can take decades to rebuild, making every win significant for the environment.

Fewer bats have led to increased insecticide use and even health impacts for people, as highlighted in a study linking bat declines to an 8% rise in infant mortality. These findings remind us of the valuable balance bats provide.

If you’ve ever wondered about the bats in your neighborhood, remember their presence is a sign of ecosystem strength and health.

Let’s celebrate the positive news and share these bright updates for bats in the Midwest!

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