An Alaska national park's yearly 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.
doesn't officially start at Katmai National Park and Preserve until Oct. 2, when fans can begin voting online for their favorite ursine behemoths in tournament-style brackets.

Grazer, the winner of the 2023 Fat Bear Contest, wades through a river in Katmai National Park and Preserve in Alaska in September 2023.Â
But on Tuesday, organizers revealed the four cub contestants in this week's contest — with the "chubby champ charging on to face the corpulent competition" in the adult bracket, as Naomi Boak of the nonprofit Katmai Conservancy put it during a livestreamed announcement.
The annual contest, which drew more than 1.3 million votes last year, is a way to celebrate the resiliency of the 2,200 brown bears that live in the preserve on the Alaska Peninsula, which extends from the state's southwest corner toward the Aleutian Islands. The most dedicated fans watch the bears on live cameras at all summer as they feast on sockeye salmon returning to the Brooks River.
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This year's contestants for Fat Bear Jr. include some familiar muzzles: Both the 2022 and 2023 junior champs are up for a repeat. They remain eligible because they still meet the criteria for being considered a cub, including remaining with a sow. Most cubs stay with their mother for about 2½ years, but the 2022 Fat Bear Jr. winner, known as 909 Jr. and who has remained with an aunt, is almost 4 years old.

Bear 806's yearling walks along along a river in Katmai National Park and Preserve in Alaska on July 5.
There's also an emotional favorite: a spring cub of Grazer, last year's Fat Bear champ. The cub's sibling died this summer after it slipped over a small waterfall on the Brooks River and was killed by a dominant adult male known as Chunk, or Bear 32 — an attack captured on the bear cams. Grazer fought Chunk in an effort to save the cub, but it later died.
Adult male brown bears typically weigh 600 to 900 pounds in mid-summer. By the time they are ready to hibernate after feasting on migrating and spawning salmon — each eats as many as 30 fish per day — large males can weigh well over 1,000 pounds. Females are about one-third smaller.
The adult contestants for the Fat Bear Week tournament will be announced Monday, with voting taking place Oct. 2-8.
Photos: Insect and animal life around the globe

Two-month-old baby hippo Moo Deng and her mother Jona are seen at the Khao Kheow Open Zoo in Chonburi province, Thailand, Thursday, Sept. 19, 2024. (AP Photo/Sakchai Lalit)

A crow and a seagull fight for a prey in Tallinn Bay, Tallinn, Estonia, Sunday, Sept. 29, 2024. (AP Photo/Sergei Grits)

A Stag in rut bellows in early morning mist Bushy Park southwest London, Saturday, Sept. 28, 2024. (AP Photo/Alastair Grant)

Deer cross a road in the woods of the Taurus region near Frankfurt, Germany, Saturday, Sept. 28, 2024. (AP Photo/Michael Probst)

A deer walks on a road in the woods of the Taurus region near Frankfurt, Germany, Saturday, Sept. 28, 2024. (AP Photo/Michael Probst)

A raptor after killing a pigeon in a garden in Frankfurt, Germany, Saturday, Sept. 21, 2024. (AP Photo/Michael Probst)

A one horned rhinoceros and its calf graze in Pobitora wildlife sanctuary on the outskirts of Guwahati, India, Wednesday, Sept. 25, 2024. (AP Photo/Anupam Nath)

A spider waits for his prey at the center of its net covered by water droplets in the forest outside Tallinn, Estonia, Friday, Sept. 20, 2024. (AP Photo/Sergei Grits)

Giraffes roam their enclosure at the Living Desert Zoo and Gardens in Palm Desert, Calif., Thursday, Sept. 19, 2024. (AP Photo/Jae C. Hong)

A visitor looks at male Hippo Tony, at the Khao Kheow Open Zoo in Chonburi province, Thailand, Thursday, Sept. 19, 2024. (AP Photo/Sakchai Lalit)

A fawn and its mother stand together in a forest of the Taunus region in Frankfurt, Germany, Tuesday, Sept. 17, 2024. (AP Photo/Michael Probst)

A swan family watches Sunday walkers at Lake Baldeney in Essen, Germany, Sunday, Sept. 15, 2024. (AP Photo/Martin Meissner)

A fourteen-pointer rests in the forest as rutting time begins in the Taunus region in Frankfurt, Germany, Tuesday, Sept. 17, 2024. (AP Photo/Michael Probst)

A beetle basks in the sun on a city meadow in Tallinn, Estonia, Monday, Sept. 9, 2024. (AP Photo/Sergei Grits)

Seagulls fly over Al Arish beach, 50 km (32,5 miles), West of Rafah border crossing between Egypt and the Gaza Strip in Al Arish, Egypt, Monday, Sept. 9, 2024. (AP Photo/Amr Nabil)

A stork stands in the nest in Wehrheim, near Frankfurt, Germany, Monday, Sept. 9, 2024. (AP Photo/Michael Probst)

Butterflies feed on flowers nectar in a forest outside Tallinn, Estonia, Tuesday, Sept. 3, 2024. (AP Photo/Sergei Grits)

A bee and a sunflower are silhouetted against the setting sun in a field Saturday, Sept. 7, 2024, near Lawrence, Kan. The field, planted annually by the Grinter family, draws thousands of visitors during the weeklong late summer blossoming of the flowers. (AP Photo/Charlie Riedel)

Panda Yuanyuan eats her birthday cake for her 20 years old at the Taipei Zoo in Taipei, Taiwan, Friday, Aug. 30, 2024. Yuanyuan was a gift from China to mark warming ties with Taiwan in 2008. (AP Photo/Chiang Ying-ying)

A sea lion is covered in sand on San Carlos beach in Monterey, Calif., Friday, Aug. 23, 2024. (AP Photo/Nic Coury)

A bee flies to a sunflower on a field in the outskirts of Frankfurt, Germany, Wednesday, Aug. 28, 2024. (AP Photo/Michael Probst)

Flamingos in their enclosure at the Tierpark zoo in Berlin, Germany, Thursday, Aug. 22, 2024. (AP Photo/Markus Schreiber)

A snail looks up as it carries its house on the back at a terrace in Gelsenkirchen, Germany, Thursday Oct. 3, 2024. (AP Photo/Martin Meissner)

Emily, a new born Rothschild's Giraffe, born on Aug. 11, 2024. stands in front of her mother Katharina, during a name giving event at the Tierpark zoo in Berlin, Germany, Thursday, Aug. 22, 2024. (AP Photo/Markus Schreiber)

Two storks stand in their nest in Wehrheim near Frankfurt, Germany, Tuesday, Oct. 1, 2024. (AP Photo/Michael Probst)

Two storks stand in their nest in Wehrheim near Frankfurt, Germany, Tuesday, Oct. 1, 2024. (AP Photo/Michael Probst)

A flock of birds fly past turbines at a wind farm, Sunday, Sept. 29, 2024, near Spearville, Kan. (AP Photo/Charlie Riedel)

Icelandic horses play at a stud farm in Wehrheim near Frankfurt, Germany, Monday, Sept. 30, 2024. (AP Photo/Michael Probst)

A raptor after killing a pigeon in a garden in Frankfurt, Germany, Saturday, Sept. 21, 2024. (AP Photo/Michael Probst)

A spider waits for his prey at the center of its net covered by water droplets in the forest outside Tallinn, Estonia, Friday, Sept. 20, 2024. (AP Photo/Sergei Grits)

Giraffes roam their enclosure at the Living Desert Zoo and Gardens in Palm Desert, Calif., Thursday, Sept. 19, 2024. (AP Photo/Jae C. Hong)

A visitor looks at male Hippo Tony, at the Khao Kheow Open Zoo in Chonburi province, Thailand, Thursday, Sept. 19, 2024. (AP Photo/Sakchai Lalit)

A lion cub, born on July 31, and mother "Indi" play in an area visible to zoo visitors for the first time, at Schwerin zoo, in Schwerin, Germany, Wednesday, Sept. 18, 2024. (Jens Büttner/dpa via AP)

Two-month-old baby hippo Moo Deng and her mother Jona are seen at the Khao Kheow Open Zoo in Chonburi province, Thailand, Thursday, Sept. 19, 2024. (AP Photo/Sakchai Lalit)

Geese stand on an outdoor table in a flooded neighbourhood in Ostrava, Czech Republic, Tuesday, Sept. 17, 2024. (AP Photo/Darko Bandic)

A fawn and its mother stand together in a forest of the Taunus region in Frankfurt, Germany, Tuesday, Sept. 17, 2024. (AP Photo/Michael Probst)

A swan family watches Sunday walkers at Lake Baldeney in Essen, Germany, Sunday, Sept. 15, 2024. (AP Photo/Martin Meissner)

A fourteen-pointer rests in the forest as rutting time begins in the Taunus region in Frankfurt, Germany, Tuesday, Sept. 17, 2024. (AP Photo/Michael Probst)

Seagulls fly over Al Arish beach, 50 km (32,5 miles), West of Rafah border crossing between Egypt and the Gaza Strip in Al Arish, Egypt, Monday, Sept. 9, 2024. (AP Photo/Amr Nabil)

A beetle basks in the sun on a city meadow in Tallinn, Estonia, Monday, Sept. 9, 2024. (AP Photo/Sergei Grits)

A bee and a sunflower are silhouetted against the setting sun in a field Saturday, Sept. 7, 2024, near Lawrence, Kan. The field, planted annually by the Grinter family, draws thousands of visitors during the weeklong late summer blossoming of the flowers. (AP Photo/Charlie Riedel)

A stork stands in the nest in Wehrheim, near Frankfurt, Germany, Monday, Sept. 9, 2024. (AP Photo/Michael Probst)

Butterflies feed on flowers nectar in a forest outside Tallinn, Estonia, Tuesday, Sept. 3, 2024. (AP Photo/Sergei Grits)

A bee flies to a sunflower on a field in the outskirts of Frankfurt, Germany, Wednesday, Aug. 28, 2024. (AP Photo/Michael Probst)

Panda Yuanyuan eats her birthday cake for her 20 years old at the Taipei Zoo in Taipei, Taiwan, Friday, Aug. 30, 2024. Yuanyuan was a gift from China to mark warming ties with Taiwan in 2008. (AP Photo/Chiang Ying-ying)

A sea lion is covered in sand on San Carlos beach in Monterey, Calif., Friday, Aug. 23, 2024. (AP Photo/Nic Coury)

Flamingos in their enclosure at the Tierpark zoo in Berlin, Germany, Thursday, Aug. 22, 2024. (AP Photo/Markus Schreiber)

Emily, a new born Rothschild's Giraffe, born on Aug. 11, 2024. stands in front of her mother Katharina, during a name giving event at the Tierpark zoo in Berlin, Germany, Thursday, Aug. 22, 2024. (AP Photo/Markus Schreiber)