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North American Wolverine

Populations of the North American Wolverine (Gulo gulo) span across the contiguous United States, Alaska, and Canada. Hunting and trapping nearly wiped out the species in the early 1900s, it has since made a steady recovery. The wolverine is currently not listed for protections under the Endangered Species Act (ESA).

In 2013, the U.S. Fish and Wildlife Service (FWS) proposed to list the North American wolverine as threatened under the ESA. The FWS pointed to climate change as the sole justification for listing the wolverine. Based on limited habitat data and climate modeling, the FWS concluded that the snow-dependent species is likely to become endangered within the foreseeable future due to increasing global temperatures, which reduces the amount of available habitat.

The state of Idaho, through the Office of Species Conservation (OSC), submitted comments in response to the Service’s proposal to list the wolverine as threatened. The comments can be read at the following link (State of Idaho Comments Regarding the Proposal to list the North American Wolverine as Threatened).

Based on feedback from the states and other interested parties, the FWS withdrew the proposal to list the North American wolverine as a threatened species in 2014. The FWS stated that the wolverine does not warrant protection under the ESA because the effects of climate change are too uncertain (i.e., climate change will not negatively affect the population within the foreseeable future).

In April 2016, the U.S. District Court of Montana vacated FWS’ final determination that the wolverine population is not currently threatened by climate change. The judge disagreed with FWS’ analysis that climate change does not pose an immediate threat and ordered wildlife officials to reinitiate the proposal to list wolverines as a threated species.

Idaho has a vested interest in wolverine conservation and has been proactively involved in research and conservation in the northern Rocky Mountains. OSC will continue to better understand wolverine behavior and advocate for increased local and national coordination.

Staff Contact:

Sam Eaton


Wolverine Photo Credit: William F. Wood CC BY-SA 4.0 on Wikimedia Commons