Fat Bear Week is back at Katmai National Park and Preserve.

The March Madness-style bracket competition pits some of Katmai National Park and Preserve 's bulkiest and most beloved brown bears against each other in the arena of public opinion is returning for its 11th year this month.

“Fat Bear Week is always a celebration of the success of the bears,” Naomi Boak, a media ranger at Katmai, previously told USA TODAY . “Not just the big boys, but the sows with cubs, the young teenage bears, the subadults.”

However, only one can be crowned Fat Bear Week champion .

Here’s what to know about the competition and when it takes place.

When is Fat Bear Week?

Fat Bear Week takes place from Sept. 23-30, NPS announced on Sept. 4.

Fat Bear Week is preceded by the "chubby cubby appet

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