Fat Bear Week Is Almost Here. Take Our Quiz to Find Out Which Fat Bear You Are.

As the sun begins to set earlier over the Brooks River, the brown bears of Katmai National Park enter a state known as hyperphagia. During this period, their biological clocks trigger an insatiable drive to consume as much food as possible. For these bears, fat is not a cosmetic concern but a vital fuel source. A bear can lose up to one-third of its body mass during the winter hibernation; therefore, the sheer volume of adipose tissue they can accumulate during the late summer and early autumn is the primary predictor of their survival through the grueling sub-arctic winter. At the height of the salmon run, a dominant bear can consume dozens of sockeye salmon a day, sometimes exceeding 20,000 calories in a single twenty-four-hour period.

The tournament itself has seen meteoric growth since its inception. What began in 2014 as "Fat Bear Tuesday"—a small-scale bracket that garnered roughly 1,000 votes—has exploded into an international event. By 2025, the competition saw a staggering 1.7 million votes cast from every corner of the globe. This year, the 2026 bracket has been revealed, featuring a mix of legendary champions, fierce matriarchs, and up-and-coming sub-adults, each vying for the title of "Fattest Bear." The bracket-style tournament uses a single-elimination format where the public votes on head-to-head matchups, with the bear receiving the most votes advancing to the next round until a champion is crowned on the final Tuesday.

The 2026 roster is particularly competitive, featuring bears with distinct survival strategies and personalities that have captured the hearts of the "bear cam" community. To help fans connect with these massive mammals, the National Park Service has even integrated personality quizzes, allowing voters to see which bear’s temperament aligns with their own. Among the top contenders this year are five bears who represent the diversity of life at Brooks River.

Leading the pack is 32 Chunk, the defending champion and a true titan of the river. Weighing in at an estimated 1,200 pounds, Chunk is an adult male who carries the physical reminders of a life lived on the edge. With a prominent brow ridge, a scarred muzzle, and a history involving a broken jaw, his rugged appearance belies a sophisticated survival instinct. Chunk is known for his patience; while younger bears may expend energy fighting for prime fishing spots, Chunk often uses his sheer size to intimidate rivals, securing the most calorie-dense locations at the falls with minimal effort. His transformation from a lean, post-hibernation scavenger to a massive, low-slung powerhouse is a testament to his dominance in the Katmai hierarchy.

In contrast to Chunk’s solitary power is 806, the fierce protector and a first-time contender in the Fat Bear Week bracket. 806 has gained a reputation among biologists and viewers for her exceptional maternal instincts. She is not only a devoted mother to her own three litters but has also been observed exhibiting alloparenting behaviors, occasionally taking on the care of orphaned cubs. However, her nurturing side is balanced by a legendary ferocity. When her family’s safety or food source is threatened, 806 is known to stand her ground against much larger males. Her presence in the 2026 tournament highlights the unique challenges faced by female bears, who must not only gain enough weight for their own survival but also produce enough milk to sustain their cubs through the winter.

Representing the younger generation is 694, often referred to as the "Social Butterfly." As a sub-adult, 694 is still growing and lacks the massive bulk of the older males, but what he lacks in size, he makes up for in adaptability and charisma. Sub-adult bears are in a vulnerable transitional phase of life, having recently been weaned by their mothers and forced to navigate the social complexities of the river on their own. 694 has excelled by prioritizing "play sessions" with other young bears, which serves as a vital way to hone his wrestling and fishing skills. Despite his social nature, he is a focused fisherman, frequently seen waiting patiently for salmon to jump directly into his path. His inclusion in the bracket celebrates the resilience of the park’s youth.

Then there is 89 Backpack, the "Chill One." Backpack earned his moniker after being spotted as a cub riding on his mother’s back through the deep currents of the Brooks River. Now an independent adult, Backpack has retained a remarkably calm demeanor. Unlike the more aggressive males who engage in frequent posturing, Backpack utilizes a "quiet strength." He often seeks out calmer, less crowded stretches of the river, avoiding the high-stress environment of the main falls. This strategy of energy conservation has clearly paid off; his before-and-after photos for 2026 show a dramatic increase in girth, proving that there is more than one way to become a heavyweight champion.

Finally, the 2026 competition features 151 Walker, the "Strategist." Walker is a bear in transition. In his younger years, he was known for being exceptionally playful and laid-back. However, as he has reached full maturity, he has begun to challenge the established social order. Walker is a keen observer, often "sizing up" his surroundings and other bears before deciding whether to engage or retreat. While he has faced some pushback from older, more established bears as he asserts his dominance, his massive frame and calculated approach to fishing make him a perennial threat in the bracket.

The success of Fat Bear Week is inextricably linked to the health of the Bristol Bay watershed. Katmai National Park is home to one of the last great wild sockeye salmon runs on Earth. The relationship between the bears and the salmon is a cornerstone of the Alaskan ecosystem. When the salmon return from the ocean to spawn in the freshwater streams where they were born, they bring with them a massive influx of marine-derived nutrients. The bears consume the fish and then distribute those nutrients across the landscape through their waste and discarded carcasses, essentially fertilizing the forest.

However, the environment is not without its challenges. Climate change, fluctuating water temperatures, and potential industrial threats to the watershed remain constant concerns for conservationists. Fat Bear Week serves as a powerful advocacy tool, humanizing the bears and creating a global constituency of people who are invested in the protection of their habitat. By participating in the vote, the public is not just engaging in a fun internet trend; they are being educated on the importance of intact ecosystems and the delicate balance of nature.

The cultural impact of the event is also a subject of sociological interest. In an era often defined by digital stress and complex global issues, Fat Bear Week offers a moment of pure, unadulterated joy. There is something deeply relatable about the bears’ singular focus on eating and preparing for a long rest. The "Fat Bear" personality quiz, which matches human traits—such as being a "protector," a "social butterfly," or a "strategist"—with specific bears, further bridges the gap between humans and wildlife. It encourages empathy and a deeper understanding of the individual lives of these animals.

As September 22 approaches, the tension at Brooks River is palpable—at least for the observers watching via the Explore.org live streams. The bears, meanwhile, remain focused on the task at hand: one more fish, one more layer of fat, one more step toward surviving the winter. Whether the crown goes to a seasoned veteran like 32 Chunk or a newcomer like 806, the true winner of Fat Bear Week is the park itself and the millions of people who walk away with a greater appreciation for the wild heart of Alaska. The bracket is set, the bears are at their peak, and the world is ready to celebrate the magnificent, heavy-set survivors of Katmai.