【Watch Mother Exchange 7 XXX Movie】

Welcome to Fat Bear Week 2021!Katmai National Park and Watch Mother Exchange 7 XXX MoviePreserve’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 canvote onlinebetween Sept. 29 through Oct. 5). Mashable will be following all the ursine activity.

---

Otis is an aging bear, but a profoundly wise one.

The Katmai bear, numbered 480, is around a quarter-century old with missing teeth. He arrived at the salmon-rich Brooks River, home to the livestreamed explore.org webcams, a month or so late this year. He looked gaunt.

But Otis, famously successful at catching fish with a tried-and-true, unflashy fishing strategy, rapidly persevered. Over the course of around seven weeks, he transformed from a bear with a visible ribcage to one of the fattest of the fat bears.

"He's certainly made up for lost time," Mike Fitz, a former Katmai park ranger and currently a resident naturalist for explore.org, told Mashable. "He's gained an incredible amount of body mass in about seven weeks."

Mashable Light Speed Want more out-of-this world tech, space and science stories? Sign up for Mashable's weekly Light Speed newsletter. By clicking Sign Me Up, you confirm you are 16+ and agree to our Terms of Use and Privacy Policy. Thanks for signing up!

All the fat bears have impressive summer transformations. But the images below show his particularly stunning 2021 change.

Otis' impressive summer transformation. Credit: n. Boak / C. Spencer / Nps / explore.org

This Tweet is currently unavailable. It might be loading or has been removed.

Otis clearly knows how to survive the long, harsh Alaskan winter hibernation, where bears subsist off their fat stores. An old brown bear is 20, and Otis has already far eclipsed that. He has a stationary approach to fishing, where he sits for hours in the same spot beneath the waterfall, as opposed to dashing in the water or standing atop the waterfall for leaping salmon like many other bears. Some might interpret this as Otis acting lethargic or disengaged.

But no. It's wise. He wastes little energy while catching bounties of calorie-rich fish over the long run.

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

"Otis is extremely patient when fishing," Fitz previously told Mashable in 2019. "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."

Otis' profit is often huge. He's a three-time Fat Bear Week champion, though other formidable bears have bested him over the past few years.

SEE ALSO: The female fat bear that's as dominant as the big, bad male bears

Otis' first Fat Bear Week match-up is happening Thursday, Sept. 30. You can vote on fatbearweek.org, or this Woobox link if the primary site — due to voting popularity impacting the page — is down.

Your vote matters.

• Entertainment
• Deals
• Life
• Games
• Digital Culture
• Shopping
• Social Good
• Science

• NYT Connections hints and answers for May 10: Tips to solve 'Connections' #699.
• New video shows a 'dummy' iPhone 8 in all its glory
• Why Ariana Grande's music is so important
• New video shows a 'dummy' iPhone 8 in all its glory
• Time to Unite
• Apple's first store in Southeast Asia is here, and this is what it looks like
• Guy accidentally farting tv graphics just might be the best thing to happen to television ever
• J.K. Rowling slams Fox contributor in the wake of the Manchester attack
• NYT Connections hints and answers for May 18: Tips to solve 'Connections' #707.
• 'Wonder Woman' U.K. premiere canceled after Manchester tragedy

• Apple sets up replacement program for certain defective iPhone 8 units
• Andy Murray wins Wimbledon, has the best ice bath ever
• Uber introduces minimum rating requirements for riders, so don't be a jerk
• 'A Star is Born' gets all the stars from critics: Review round
• dELiA*s may be a thing of the past, but its aesthetic is stronger than ever
• Twitter bug could make it appear you liked Donald Trump's tweets
• David Beckham shares adorable birthday message to his daughter Harper
• Classic FM fans are having a field day with David Cameron's humming track
• The Latina Disney princess we've been waiting for is here in 'Elena of Avalor'
• How these 4 teens decided to take on bullying — and won

• Best Hydro Flask deal: Save $10 on a 24
• Photo of armed policeman blowing a kiss to ladies in Manchester will melt your heart
• Ridiculous news cycle leads Jon Stewart and HBO to cancel their show
• Why we'll never see the likes of Roger Moore again
• Best robot vacuum deal: Save $140 on roborock Q7 Max Robot Vacuum
• People are moved by this homeless man's story of helping the Manchester victims
• Perfectly extra 5
• Emojipedia will let you track the popularity of your favorite emoji
• Philips now allows customers to 3D print replacement parts
• Apple launches App Development Curriculum for college

• NYT Connections Sports Edition hints and answers for May 19: Tips to solve Connections #238
• Metal heads are building a massive pipeline to funnel 400,000 litres of beer
• Facebook's Trending Topics now offer you a choice of what publisher you want to read
• Those movie subtitles you downloaded might open your doors to hackers
• The Baffler’s May Day Round Up
• Benicio del Toro is looking real shady in 'Star Wars: The Last Jedi'
• 1Password has a new tool for keeping your data safe at the border
• IFTTT wants to connect all those companies and their connected devices
• The cicadas aren't invading the U.S.
• Apple's reportedly working on next generation microLED displays