Picture this: massive brown bears, their fur glistening in the Alaskan sun, wading through rushing rivers to catch salmon. These aren’t just any bears; they’re the stars of Fat Bear Week, nature’s most delightful celebration of chunky champions.

Voting for Fat Bear Jr. Begins Thursday when 909 Jr. will face 806 Jr. while 910 Jr. faces 128’s Spring Cub. The winners of those contests will face each other on Friday when the Fat Bear Jr. champion will be decided.

Who is the chunkiest brown bear of them all? That's what the National Park Service is trying to determine during its annual Fat Bear Week competition.

An Alaska national park's annual celebration of the beefy, brown and bristly is getting underway as some of the chunkiest bears on the planet fatten up for their long winter slumber

Organizers revealed the four cub contestants in this week's Fat Bear Jr. contest — with the “chubby champ charging on to face the corpulent competition” in the adult bracket.

Every year, the biggest bears at Katmai National Park go head-to-head in an online bracket. But not before their cubs compete for the title of the fattest.