Alaska’s Fat Bear Week: Vote for the Fattest Bear Before Hibernation

What contest can turn a few extra pounds into a true survival feat? In Alaska, Fat Bear Week has the whole world voting for Katmai’s most imposing brown bears, just before they retreat to their dens to face winter.

Behind this quirky election, Katmai’s bears are mainly playing for their winter survival

At first glance, Fat Bear Week resembles one of those Internet curiosities that the web loves. Bears photographed before and after summer face off in duels. Internet users then choose their favorite. Yet at Katmai National Park, getting fat is no game. The fat accumulated is a real lifeline.

When winter approaches, brown bears typically retreat to their dens from October or November. For several months they may go without eating or drinking. Their bodies then draw on the reserves built up during the summer. According to the National Park Service, some lose up to a third of their body mass during this dramatic phase of their biological cycle.

So the action happens during the summer and early autumn. At Katmai, the salmon swimming up Brooks River provide an extremely energy-rich feast. The bears sometimes favor skin, brain and eggs, particularly rich in fat. This abundance allows the largest individuals to gain more than a hundred kilograms before winter arrives.

From a simple Facebook game to a phenomenon followed in more than 100 countries

The story began modestly in 2014. A park ranger noticed how much a single bear changed appearance between June and September. The team then imagined Fat Bear Tuesday. On that day, a few photos were put up for voting on Facebook. The success quickly exceeded expectations. The event then became a full week of competition.

Twelve years on, the event is no longer anecdotal. For the 2026 Fat Bear Week edition, held from September 22 to 29, contestants advance in a knockout tournament. The previous year, more than 1.7 million votes from over 100 countries were recorded. Bear 32, nicknamed Chunk, had ultimately won the title.

Chunk falls in 2026, proof that the river still holds some surprises

Chunk came into the year with a target on his back. Champion in 2025 after succeeding the famous 128 Grazer, he could dream of a back-to-back title. But Fat Bear Week loves to derail pre-written scripts. On September 24, 164 Bucky eliminated him with 118,731 votes to 46,053 for the reigning champion.

The public doesn’t judge merely a silhouette. Comparative photos, biographies and live cameras allow viewers to follow the animals around Brooks River. Since 2012, these images reveal their fishing techniques, their rivalries and their habits. Little by little, they have transformed numbered bears into familiar characters for the online audience.

This proximity explains part of the phenomenon. Watching a bear catch a salmon may seem spectacular. But following the same individual for several weeks tells another story: a race against the calendar. Behind every rounded belly lie thousands of calories patiently accumulated. They will need to enable the animal to face a season when food becomes inaccessible.

Under the swollen bellies lies an ecosystem whose balance remains precious

The contest thus has a more serious objective than its name might suggest. The National Park Service notes that salmon are a keystone species of Katmai’s ecosystem. Their abundance nourishes the bears, among others. It also testifies to the richness of the Bristol Bay watershed, where significant wild populations of sockeye salmon persist.

Fat Bear Week ultimately achieves a curious feat. It makes the science of hibernation accessible through a tournament that is almost athletic. When the 2026 champion is crowned on September 29, a bear will win a title. But one question will hang over Brooks River: how long can this extraordinary natural feast remain as generous?