Fat bear champ is still gobbling fish and getting fatter

The master of energy economics.
By
Mark Kaufman
 on 
Fat bear champ is still gobbling fish and getting fatter

Welcome to Fat Bear Week 2023! Katmai National Park and Preserve’s brown bears spent the summer gorging on 4,500-calorie salmon, and they've transformed into rotund giants, some over 1,000 pounds. The Alaskan park is holding its annual playoff-like competition for the fattest of the fat bears (you can vote online between Oct.4 through Oct. 10). Mashable will be following all the ursine activity.


Otis has probably devoured some 25,000 fish in his life. Maybe considerably more.

Weeks after winning the 2021 Fat Bear Week contest — a pre-hibernation celebration of these bears succeeding in the wild — the livestreamed explore.org cameras in Katmai National Park and Preserve captured Otis continuing to successfully catch salmon on Oct. 21, deep into the Alaskan fall. Many Katmai bears are about to hibernate, if they haven't already.

The salmon Otis caught is reddish in color, meaning the creature is nearing the end of its life and Alaska's famous salmon run is waning. Salmon absorb their scales (revealing the red flesh underneath) when they're preparing to reproduce. Soon after, they die.

Otis is still filling up on salmon to survive the long, harsh winter hibernation. He'll subsist off his fat stores, and lose about one-third of his weight. But he's also preparing for the spring of 2022, when he emerges from his den.

"In Katmai, there is typically little food available for bears in spring, especially early and mid-spring," explained Mike Fitz, a former Katmai park ranger and currently a resident naturalist for explore.org. "Any extra fat that Otis has when he emerges from hibernation will be needed in springtime, which is an extended season of hunger for most Katmai bears."

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You can see Otis' late October catch below:

The video shows Otis' unique — and profoundly successful — fishing style. Otis exerts very little energy when fishing. He doesn't walk around. He doesn't dash. He stays mostly solitary at the river's edge, waiting for fish to swim by. And he grows impressively fat.

"I like to describe Otis as a master of energy economics. He uses his patience and experience to make a huge profit in calories while expending little energy," Fitz told Mashable in 2019.

"I like to describe Otis as a master of energy economics."

Even though Otis is missing teeth and might be the oldest of Katmai's famous fat bears (at some 25 years of age), his fishing prowess still enabled him to fatten up in 2021. Otis even arrived at Katmai's salmon-filled Brooks River late this summer. But as the image comparison below demonstrates, he transformed from a gaunt bear to a fat bear in just seven weeks.

Mashable Image
Otis' impressive 2021 transition. Credit: N. Boak / C. Spencer / NPS

We wish you a successful hibernation, Otis.

Topics Animals

Mashable Image
Mark Kaufman
Science Editor

Mark is an award-winning journalist and the science editor at Mashable. After working as a ranger with the National Park Service, he started a reporting career after seeing the extraordinary value in educating people about the happenings on Earth, and beyond.

He's descended 2,500 feet into the ocean depths in search of the sixgill shark, ventured into the halls of top R&D laboratories, and interviewed some of the most fascinating scientists in the world.

You can reach Mark at [email protected].


More from Fat Bear Week

This fat bear won't win Fat Bear Week. But the bears know he's king.
The dominant bear 856 photographed in Katmai National Park and Preserve's Brooks River in 2022.


This bear looked frail and weak. Look at his transformation.
The aging bear Otis (bear 480) seen looking quite gaunt in July 2023.

What's Fat Bear Week?
The Fat Bear Week Champion bear 747 fishing in Katmai National Park and Preserve's Brooks River.

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