It's time for everyone's favorite bracket battle Fat Bear Week. The annual online contest returns to Katmai National Park in Alaska as massive brown bears gorge, bulk up and compete for the internets vote in a wild, fish-fueled showdown where size is everything.

This year's competitors will be announced live on YouTube on Monday evening. Once the bears and brackets are set, the ferocious game is on.

It's a single-elimination tournament where the public can vote for the bear they believe best exemplifies fatness and success in brown bears. The bear with the most votes advances to the next round but only one will be crowned Fat Bear Week champion on Sept. 30.

In addition to voting and advocating for their favorite bear, enthusiasts can also watch livestreams from cameras of the bears bulk

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