Science Supports Removing Grizzly Bear Endangered Species Protection

Published: 
Friday, September 29, 2017


Grizzly bear with cub in Yellowstone National Park. Courtesy of Frank van Manen / USGS.

It comes as no surprise that environmental groups filed a lawsuit in U.S. district court on August 29 to stop delisting of the grizzly bear as a threatened species. According to WildEarth Guardians, the U.S. Fish and Wildlife Service’s decision on July 30 to delist is “riddled with flaws, not based in science nor the law, and places this icon of all that is wild squarely in crosshairs of extinction once again.”

They claim that delisting will increase human encounters, thus leading to killing — euthanizing, if you like. Of course, more encounters are already happening for two reasons. First, Yellowstone grizzly populations have risen from 136 in 1975 to more than 700 today. Second, today’s grizzlies have little or no fear of humans because they have never been hunted.

Let’s take a more scientific approach, one followed by a world-renowned ecologist, Daniel Botkin and one that establishes a benchmark for how many grizzly bears there were before human settlement on the western frontier displaced the bear. His book, Our Natural History: The Lessons of Lewis & Clark, Botkin calculates a density of 3.7 bears per 100 square miles. This is based off of Lewis and Clark’s Corps of Discovery expedition, which reported sightings of 37 grizzly bears over 1000 square miles in Montana. 

He then compares that density to a 1985 Audubon Wildlife Report, which estimated that there were between 600 and 900 bears in the “present verified range” amounting to 20,000 square miles in Montana, Idaho, Wyoming and Washington. That amounts to between 3 and 4.5 bears per 100 square miles or roughly the density observed by the Corps. Botkin also compares his density calculation to one by biologists Frank and John Craighead estimating an average density of 2.9 bears per 100 miles between 1959 and 1967 when there were 230 grizzly bears in Yellowstone.

Today, there are three times that number in the Great Yellowstone Ecosystem (GYE). In other words, if the goal is to recover grizzly densities in Yellowstone to their “natural” state, the bear has recovered.

Continuing to use Lewis and Clark’s journals, Botkin says the Corps saw one grizzly near the headwaters of the Missouri at the Three Forks “which ran away from them. They killed two more grizzlies on July 26 [1805] when the expedition was still near the headwaters of the Missouri River . . . . From the headwaters of the Missouri the expedition traveled up the Jefferson where they saw the last grizzly of the outward bound journey on July 31.”

The importance of these observations is twofold. First, bears on the plains along the Missouri had little fear of humans because this was no-man’s-land. Neither native nor non-native people inhabited that region so bears were not threatened by the Corps and therefore tended to charge rather than run away. When the Corps got to the Three Forks, however, there were plenty of humans with guns, no doubt shooting at grizzlies so they “ran away from them.”

Second, the fact that the Corps saw no grizzlies traveling through what today is prime mountain grizzly habitat, such as the Selway-Bitterroot Wilderness where many groups want grizzlies “reintroduced,” suggests that we are recovering grizzlies in an area where there were not any in 1805.

This brings us back to the question of whether enforcement of the Endangered Species Act is scientifically or politically based. If it were science based, removing the grizzly from the threatened list makes sense because densities in the GYE have recovered to pre-development densities. Moreover, Lewis and Clark’s observations suggest that more encounters with hunters are likely to make the bears less likely to seek and confront humans.

Opponents of delisting claim it will mean the end of protection for the grizzly bear. To the contrary, it means the beginning of protection by state and federal hunting laws rather than a broken Endangered Species Act.

Let’s not kid ourselves, endangered species policies are all about politics, not science. If we aren’t willing to rationalize the Endangered Species Act, the best we can hope for is that politicians devolve more authority to wildlife managers rather than to judges.

This article originally appeared in The Hill on September 6, 2017.

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The Hill
Terry Anderson is a senior fellow at PERC and the former President and Executive Director of PERC as well as the John and Jean De Nault Senior Fellow at the Hoover Institution, Stanford University. He believes that market approaches can be both economically sound and environmentally sensitive. His research helped launch the idea of free market...
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