On an uncommonly sunny day in early February, I stood in a tract of old-growth forest not far from the Suiattle River to watch a missing mammal return to the North Cascades. With the return of the fisher, this area is one step closer to whole.
The fisher (Pekania pennanti) is one of the largest North American weasels. Adult females weigh four to six pounds and measure about 30 to 36 inches long, including tail, when fully grown. Males are about 20% larger, growing upwards of 13 pounds and nearly four feet long. Despite the name, fish are not a primary prey. Instead, fishers are wolverines of the forest. Highly arboreal, cylindrical in shape, and agile in motion, they are formidable predators of rodents, rabbits, hares, grouse, and other small to medium-sized animals.
Fishers were functionally extirpated from Washington by the mid 20th century due to habitat fragmentation and, especially, unregulated trapping. Surveys in the 1990s and early 2000s failed to find evidence of any viable fisher populations. As a first step to recover the species in the state, a coalition of public agencies, tribes, and private organizations released fishers in Olympic National Park from 2008-2010. This was followed by similar efforts in Gifford Pinchot National Forest and Mount Rainier National Park from 2015-2017. The North Cascades National Park Service Complex and Mount Baker-Snoqualmie National Forest began to host the fisher’s return last fall, which is how I found myself standing in the woods with about twenty other people on February 6.
Fishers prefer mature forests with a high canopy, relatively large diameter trees, and an abundance of downed trees. Dead standing trees are particularly important to fishers, as they den exclusively in tree cavities. The release site for the fishers this day seemed particularly well suited to their needs.
Fortunately and conveniently, healthy populations of fishers remain in British Columbia and Alberta and they serve as the source for the restoration effort. Fishers from western Canada are also genetically similar to those that used to inhabit Washington. Canadian trappers were paid to capture live, healthy animals. The Calgary Zoo temporarily housed the fishers while veterinarians evaluated their health and surgically implanted tiny radio transmitters to assist biologists in tracking them.
Twelve hours before release, these particular animals were still in Calgary. At 1 a.m., the fishers were flown to Abbotsford, British Columbia where they were picked up by biologists and driven into Washington. By early afternoon, a gang of biologists and a few interested souls like me were unloading the cargo and carrying the fishers a short distance to the release site.
Our group formed a semi-circle around the crates to watch the release. Conversations quieted to a whisper or died in anticipation as the crates were opened one at a time. To coax them out, a screened vent was opened at the top and a volunteer blew a puff of air into the container. I’m unsure if this was as annoying as someone blowing air into my ear, but the trick worked. The fishers shot out like a flash and bolted into the forest.
Six fishers were released that day bringing the total number currently released in the area to 24. The release efforts will continue until about 80 fishers are reintroduced to the area. Biologists will track, monitor, and study the animals to assess survival rates, identify where they go after release and where they establish home ranges, the types of foods they eat, and the diseases and parasites they suffer from.
The effort has a high chance of success. Reintroductions, however, are rarely so simple. Fishers, although not well known among the general public, are relatively non-controversial animals. They don’t evoke the same emotional reactions in people as grizzly bears or wolves, for example.
More than that, however, the forested habitats along the core and margins of the North Cascades are largely intact. Land managers needn’t take extreme, expensive, time-consuming measures to restore the ecosystem to a point where it could support fishers again. It could always support them. We just didn’t allow fishers to survive here.
Because prior generations had the foresight to protect places like North Cascades National Park and Glacier Peak Wilderness, we have the opportunity to restore fishers to land they once knew as home. Situations like these are becoming increasingly uncommon. People have fundamentally altered so much of the Earth to preclude the reintroduction of many extirpated species into their historic ranges. (There’s no substantial habitat available for bison in Iowa, for example.)
As humanity’s footprint grows, undeveloped landscapes are increasingly valuable, not for the resources we can exploit within them (including supposedly non-consumptive uses like solitude), but as repositories of biodiversity and ecosystem health. To adapt an idea from Thoreau, future generations, I believe, will measure our legacy not by what we invented and consumed, not by our material wealth, but by what we can afford to let alone.
I’ll probably never see any of these fishers ever again. Even if the population increases to hundreds of individuals, they’ll remain reclusive neighbors. If I’m lucky, I may find a track in fresh snow or its scat on a log. But even that doesn’t matter. I’ll know they are there and I’ll know the landscape is healthier because of it. The return of the fisher represents, at least in one small way, the success of our ability to let one place—North Cascades—alone.