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Lewis and Clark

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Grizzly Bear

Its Ferocious Reputation Grew From Stories

As Lewis and Clark broke winter camp in present-day North Dakota to head west, the Mandans warned the explorers to be on the lookout for grizzly bears, fierce, powerful creatures. Just a few weeks later, the Corps met their first of many grizzlies. The men’s journals are filled with stories — of how shot and wounded bears maintained enough strength to pursue them, of the time when a bear chased Lewis into the river.

As these stories were retold by others, the bears’ reputation grew tremendously. Some even said the bears thirsted for human blood. Their scientific name — ursus arctos horribilis — permanently secured in place their ferocious, mean reputation, which largely contributed to their decline. As pioneers moved west, fed by these stories of blood-thirsty creatures, they shot and poisoned many bears. Further, as land became fragmented, bears no longer had freedom to roam. They retreated to rocky, forested places, away from men.

In Their Own Words...

"These bear being so hard to die reather intimidates us all; I must confess that I do not like the gentlemen and had reather fight two Indians than one bear."

~ Lewis, shortly after a bear — that had been shot — pursued one of his men

About 100,000 grizzly bears roamed the Great Plains and the Rocky Mountains during Lewis and Clark’s time. Today, only about 1,000 grizzly bears still exist in the lower 48 states, and many of their last refuges are at risk.

Half of these remaining bears live in the mountains and plains along Montana’s Rocky Mountain Front — their last stronghold on the plains. Maintaining this open, vibrantly diverse landscape is critical to their longevity. In the last 20 years, the Conservancy and private landowners have conserved nearly 47,500 acres in this area, at the heart of which lies the Conservancy’s 15,500-acre Pine Butte Swamp Preserve.

Photo: Grizzly Bear, © TNC / Ben Thomas

Grizzly Bear

Conservation Profile

Listed as Threatened in the lower 48 states
Historic Distribution
Western United States, from the Canadian border to Mexico and east to the Great Plains

Current Distribution
Scattered populations exist in Idaho, Montana, Washington and Wyoming. Outside the lower 48 states, grizzly bears can be found in Canada and Alaska, where they are not classified threatened.

Reproduction
Moms — each January — give birth to one to five cubs, usually two. More than 50 percent of cubs die their first year.

Lifespan
About 25 years.

Interesting Facts
Grizzlies hibernate about five months of the year. During this time, they live off fat. Come summertime, they emerge in search of food.

Plants make up 75 percent of their diet.

Male grizzly bears often roam 600 to 1,000 miles. Females roam one-third of that.

Grizzly Habitat is Protected Along the Trail at the Conservancy’s
Ball Creek Preserve, ID