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News Release

Challenge Filed Over Vermont’s Refusal to Protect Endangered Bats from Deadly Insecticide Spraying

Monday, August 16, 2021


Vermont Law School’s Environmental Advocacy Clinic is representing a coalition of environmental groups in the lawsuit.

The Vermont Natural Resources Council and Center for Biological Diversity sued Vermont’s Agency of Natural Resources today for refusing to require the Brandon-Leicester-Salisbury-Goshen-Pittsford Insect Control District to apply for permission to harm five threatened and endangered Vermont bat species.

The Insect Control District sprays the toxic insecticides malathion and permethrin for mosquito control in the habitat of the Indiana bat, northern long-eared bat, little brown bat, eastern small-footed bat and tricolored bat, all of which are protected by Vermont’s Protection of Endangered Species Act. The coalition, along with numerous allies and supporters, provided the state agency with an expert report by Arrowwood Environmental in 2019 detailing how the district’s activities harm or can kill these imperiled bats, already threatened by white-nose syndrome and habitat loss.

“Vermont’s endangered species experts have spoken clearly,” said Mason Overstreet, staff attorney at Vermont Law School’s Environmental Advocacy Clinic. “Poorly regulated pesticide spraying is putting the state’s threatened and endangered bats at risk. ANR’s decision to ignore both the scientific consensus and the plain-preventative language of Vermont’s endangered species law abandons their responsibility to protect vulnerable wildlife.”

The pesticide spraying occurs on summer nights when bats are hunting for flying insects. Flying low through the chemical plume of pesticides, the bats are exposed to toxic droplets that they can inhale, absorb through their thin-skinned wing membranes, or get on their fur and later ingest while grooming. They can also catch and eat flying insects contaminated with the chemicals. These pesticides are known to cause neurological and physiological stress and injury to bats.

“Vermont’s Endangered Species Act is a critical law for protecting animal species from a variety of threats, including being poisoned by toxic chemicals,” said Brian Shupe, executive director of the Vermont Natural Resources Council. “ANR generally does a commendable job of protecting endangered resources, but in this instance needs to step up and apply this law to an activity that places these endangered bats at significant risk.”

In March of 2021 the Endangered Species Committee, a scientific advisory group to the secretary of the state’s natural resource agency and the commissioner of the Department of Fish and Wildlife, unanimously and formally recommended to the agency that it require the insect-control district to begin the incidental-take permitting process to continue spraying the pesticides. The biologists stressed that the Agency of Natural Resources was the only state body with the expertise and authority to protect bats and that a permit was the only mechanism available. The committee’s evaluation process included an independent scientific review by its Mammal Scientific Advisory Group. However, on July 19, 2021, the agency formally denied the recommendation to require a permit.

“There’s no doubt that Vermont’s refusal to follow science and the law will result in these amazing, imperiled animals being harmed by toxic insecticides,” said Lori Ann Burd, environmental health director at the Center for Biological Diversity. “Given that bats actually help to regulate mosquito populations, the state’s reckless decision to allow them to be killed in order to kill mosquitoes is a shortsighted choice that will cause long-term harm. It leaves us no choice but to go to court to protect them.”

The groups are represented by Mason Overstreet of Vermont Law School’s Environmental Advocacy Clinic and Ron Shems, Esq., Tarrant, Gillies, Richardson, & Shems LLP.

The Center for Biological Diversity is a national, nonprofit conservation organization with more than 1.7 million members and online activists dedicated to the protection of endangered species and wild places.

Through research, education, collaboration, and advocacy, the Vermont Natural Resources Council (VNRC) protects and enhances Vermont’s natural environments, vibrant communities, productive working landscapes, rural character, and unique sense of place, and prepares the state for future challenges and opportunities.

Vermont Law School’s Environmental Advocacy Clinic (EAC) is a public interest law firm housed within Vermont Law School. The EAC focuses on legal actions in court and with agencies that focus on safeguarding climate, protecting waters, championing wildlife and habitats, and fighting for healthy communities. Students work on the frontlines of environmental advocacy, learning how to be lawyers by tackling real-world environmental cases. Visit to learn more.