Press Release
U.S. Fish and Wildlife Service Extends Public Comment Period on Proposed Use of Vaccine to Protect Prairie Dogs, Endangered Black-footed Ferrets

LEWISTOWN, MT – The U.S. Fish and Wildlife Service (Service) announced today a 30-day extension on the public comment period for two Environmental Assessments (EA). These EAs propose the use of a vaccine to protect prairie dogs and endangered black-footed ferrets on Charles M. Russell and UL Bend National Wildlife Refuges in northeastern Montana.

With today’s announcement of the comment period extension, the new deadline for public input is June 13, 2016.

During the initial 30-day comment period, the Service received significant interest from local communities. The Service believes it is important to provide all interested stakeholders with the opportunity to engage in the process of deciding how to best manage our shared natural resources, which is why it has decided to extend the public comment period.

As part of its ongoing efforts to conserve the rare black-footed ferret, the Service is proposing to administer an oral sylvatic plague vaccine for the species’ primary prey: prairie dogs.

Prairie dogs are susceptible to sylvatic plague, which can decimate entire colonies of the ground-dwelling animals. Black-footed ferrets rely almost exclusively on prairie dogs as a source of food and shelter, so efforts to maintain and grow prairie dog colonies would benefit establishing and growing ferret populations.

For several years, the Service has partnered with the U.S. Geological Survey and National Wildlife Health Center to evaluate the effectiveness of these vaccinations. Results from that work indicate that the vaccine helps mitigate the effects of plague.  Now that the initial safety and research phases have proven successful, the Service is proposing to apply the vaccine at larger scales.

The first EA available for public comment considers depositing single, vaccine-laden, peanut-butter flavored baits uniformly across prairie dog colonies on at Charles M. Russell and UL Bend National Wildlife Refuges at a rate of 50 doses per acre.   

The second EA evaluates the use of Unmanned Aircraft Systems (UAS) to apply the vaccine on the same refuges and dosages.

Today’s announcement extends the comment period for both EAs for an additional 30 days. The new deadline for submitting comments is June 13, 2016.

Comments may be emailed to: or sent by mail to: Attn: Randy Matchett, U.S. Fish and Wildlife Service, 333 Airport Road, Lewiston, Montana 59457.

The mission of the U.S. Fish and Wildlife Service is working with others to conserve, protect, and enhance fish, wildlife, plants, and their habitats for the continuing benefit of the American people. We are both a leader and trusted partner in fish and wildlife conservation, known for our scientific excellence, stewardship of lands and natural resources, dedicated professionals, and commitment to public service.

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Story Tags

Endangered and/or Threatened species
Wildlife restoration