Few moments in nature are more breathtaking than seeing a grizzly bear mother and her cubs wandering through the wild. Whether you’re in Yellowstone or Grand Teton National Park, these legendary bears — symbols of strength and survival — embody both raw power and surprising tenderness.
Behind every roaring adult grizzly is a devoted mother who fiercely protects her young, teaching them how to navigate the wild frontier of North America.
Life of the Grizzly
Grizzly bears, a subspecies of the brown bear, once roamed across most of the western United States. Today, they’re found primarily in Alaska, western Canada, and pockets of the northern Rockies, especially in Yellowstone and Grand Teton National Parks. Adult males can weigh up to 700 pounds, while females typically reach 300–400 pounds. Despite their size, grizzlies can sprint over 30 miles per hour — faster than a horse for short bursts.
They’re omnivores with an adaptable diet, eating everything from berries, roots, and fish to elk calves and carrion. Their incredible sense of smell — one of the best in the animal kingdom — helps them locate food from miles away.
Mother Bears & Cubs
Each spring, when the snow melts and the mountains come alive again, mother grizzlies (sows) emerge from their winter dens with tiny cubs in tow — usually about one to three of them, but as many as 5 cubs have been documented at one time. These cubs are born in January or February, while the mother is still in hibernation, and they start life no bigger than a soda can, weighing about a pound. By the time they step out into the sunlight for the first time, they’ve already tripled in size, clinging close to their mother’s side for warmth, milk, and safety.
For the next two, and more recently even three years, she teaches them everything they need to know to survive — how to find food, climb trees, fish for trout, and sense danger. The relationship is tender but strict; a mother grizzly is one of the most protective animals on Earth, willing to fight off wolves, mountain lions, and even bigger, stronger male bears to keep her cubs safe.
Survival in the Wild
The journey to adulthood is a dangerous one. Many cubs don’t survive their first year, often falling prey to larger males or predators. In fact, a mama bear won’t mate until her cubs officially “leave home” to go live on their own, and sometimes, males (boars) will attack and kill the cubs to make the female want to mate again. Of course, the mother will try her hardest to defend her cubs, sometimes even to the death, but make no mistake, it’s a brutal way of life for grizzlies. In general, the most dangerous time to encounter a mama bear is when her cubs are nearby. Even just the perception of a threat is enough to make mama grizz come charging in, slinging paws and claws first, and asking questions later.
This is also why Yellowstone’s visitors are urged to keep a safe distance of at least 100 yards — not just for their own safety, but to give these families space to thrive without stress or interference.
By the time they’re weaned, cubs can weigh over 100 pounds and are strong enough to fend for themselves. Watching a mother grizzly finally send her young off into the world is both heartwarming and heartbreaking — a powerful moment that mirrors the cycles of nature itself.
And these massive cubs in Grand Teton National Park might be close to that age.
Grizzly 399
Luckily enough, the person filming is in their car so they can easily escape, but you can see a massive mama grizzly bear trudging directly towards the car in the snow, with four pretty big cubs following behind. This mama is actually famed Grizzley Bear 399, one of the most popular bears in North America. Studied and observed since birth in 1996, she went on to have 22 cubs and grand cubs, with these 4 big cubs (born in 2020) being her largest litter ever. She had one more single cub in 2023, making her the oldest known sow to give birth in the greater Yellowstone area.
Now it appears that these cubs are about 2 years old when the video was taken (late 2021), and there may be a good explanation for why they’re still with mama. According to BBC, more and more bears being hunted by humans may contribute to mama bears hanging on to their cubs for longer than usual.
Joanie Van de Walle of the University of Sherbrooke in Quebec, Canada said:
“Because females that care for their cubs longer survive better under the hunting regulation, we say that hunting has a selective effect (it artificially determines which females are going to survive and reproduce based on their reproductive behavior). Our hypothesis was thus that hunting regulation could favor longer maternal care in this population. Therefore, the observed change in female reproductive behavior could be the result of the increasing hunting pressure in the population.”
Nevertheless, just look at the absolute monster size of 399 and her bear family… true legends of the wild.
Grizzly 399 tragically passed away in late 2024 after she was struck by a vehicle in Snake River Canyon. It was a tragic accident, and the driver was cleared of any wrongdoing, but it just goes to show you that one of the largest threats to these beautiful beasts are… us humans.
Her ashes were spread across Grand Teton National Park.
Chowing On A Elk Calf
Popular with tourists, “Bear 399” is arguably the most famous grizzly bear in the world. She is 7-feet tall, weighs 400-pounds and although she has spent most of her life in close proximity to tourist activity, the bear had never had a negative run in with humans.. until her death in 2024.
Rafael Sandoval was exploring Grand Teton National Park when he captured an absolutely awe inspiring sequence of photos of Bear 399 hunting down an elk calf to feed her own cubs.
The pictures were originally shared by wildlife photographer Rafael Sandoval of Jackson Hole EcoTour Adventures (give him a follow).
“So this just happened last night and my heart is still racing… This grizzly sow #399 bagged an elk calf for a dinner for five after an intense chase. For the past few months, bears in the Greater Yellowstone Ecosystem have been browsing on nutrient dense vegetation such as grasses, flowers and roots.
However, as prey species like elk, bison and deer begin dropping calves like it’s going out of style, the bears have begun to switch over to more savory menu options.
The CALFeteria is open, folks!”
Even though it’s only an elk calf, the raw power and speed of the grizzly is on full display. Grizzlies are capable of reaching speeds of 35 mph, which is terrifyingly fast when you think about it. In one photo the bears long sharp claws are clearly visible as it closes in and overwhelms the baby elk. The fact that the mama bear had 4 cubs in tow to feed somehow makes the little elk’s demise less sad.
Once the elk was on the ground, those baby bears jumped on that thing like drunk people on a 2AM pizza.
