Yellowstone Grizzly Bears vs. Wolves

For decades, the sole rulers of Yellowstone were grizzly bears. Today, they are learning how to cope with the rise of an equal competitor - the reintroduced gray wolf.
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Grizzly sow with three cubs and two wolves eye the same dinner at Alum Creek in Yellowstone National Park

Grizzly sow with three cubs and two wolves eye the same dinner at Alum Creek in Yellowstone National Park

Some of the most fascinating things observed during the Yellowstone wolf reintroduction program, which began in 1995,  involve the interaction between wolves and grizzly bears, says Doug Smith, the Yellowstone Wolf Project's leader.

More grizzly bears are showing up near wolf dens, and grizzly bears are taking away more wolf kills.

Smith says grizzlies are often attracted to wolf dens because of the "stank aroma" existing from the leg bones and other food items the alphas bring back to feed to their young.

The grizzlies are more powerful, but the wolves are quicker and out-number the bear, says Smith. 

Grizzly Bear and Wolf

Grizzly Bear and Wolf. Photo NPS Doug Smith

"It's almost like the wolves are the mosquitoes buzzing around the bear's head," Smith says. "Although individual mosquitoes can't overpower you, if there are enough of them, they'll win. That's sometimes what happens with grizzlies and wolves. The bear gets near the den, and wolves just annoy the heck out of him."

"The wolves in Yellowstone won't give up. They just constantly orbit around the bear. I've actually seen one wolf bite a bear in the butt when he turned around," says Smith.

But around wolf kills, it's another story. In these cases, the grizzly is almost always the victor.

One time Smith watched as one bear held 24 wolves at bay at a carcass. The wolves had taken down a bull elk, but the bear took over the meal. Another time, he says there were 10 wolves and four bears on a wolf kill. The biggest bear controlled the situation. All of the wolves and the three other bears "sat around and waited for their turn."

Without a doubt, Smith says Yellowstone's grizzlies are benefiting from the wolves' presence due to their ability to successfully usurp the large canid's meals.

There has been opposition to the wolf reintroduction program by some ranchers and other groups, but for the most part, the program has been successful without bothering the bears.


West Yellowstone Grizzly & Wolf Discovery Center. Photo by John Williams.

Grizzly & Wolf Discovery Center

Complete your vacation to Yellowstone and Grand Teton national parks by visiting the not-for-profit Grizzly & Wolf Discovery Center in West Yellowstone, Montana. Observe live bears and wolves in naturalistic habitats.

Grizzly bear in Yellowstone

Yellowstone Grizzly Bears By the Numbers

The grizzly population beat all odds after teetering on the brink of extinction. It grew from 136 bears in 1975 to around 700 in 2016.

Grizzly bear. Photo by Jeff Vanuga

Where to See Bears, Wolves and More in Yellowstone and Grand Teton

Wildlife is abundant throughout these two national parks. See them in their natural habitat in the areas they frequent most.

Black bear near Indian Creek Campground in Yellowstone.

What Do Yellowstone Bears Eat?

Bears are omnivores. That means they eat both meat and plants. But bears also have seasonal needs for food based on a hibernation period.

Black bear crossing the road in Yellowstone. Photo by NPS Jim Peaco.

Yellowstone Bear Jams on Roads

When Yellowstone National Park visitors behave appropriately around roadside bears it's a positive experience for both bears and people.

Grizzly bear in Yellowstone Park

Bear Hibernation and Reemergence in Yellowstone

When do the Yellowstone bears hibernate and when do they wake and come out of their dens? See photos and watch a video.

Yellowstone Wolf Howling

How Many Wolves are in Yellowstone?

There are roughly 60 wolves grouped into 8 different packs inside Yellowstone, but the number has constantly fluctuated in recent times.

Yellowstone elk.

Gray Wolves Impact Elk inside Yellowstone

How wolves in Yellowstone have impacted their environment is an evolving story. What's happened regarding ungulate populations, hunter harvest, domestic livestock, and land use.

Wolf Pup and Mother at Den Site

Yellowstone Gray Wolves Reproduce and Relocate

Yellowstone wolves have had no problems hooking up with mates, forming packs and having pups. The original 65 wolves that were introduced to Yellowstone and Central Idaho have grown to 835 wolves.