Fat Bear Week

2023 Fat Bear Week Endorsement

/ Mike Fitz / 10 Comments

Think of a mama bear. What does that idea conjure in your mind? Perhaps it is fierceness, since mother bears are ornery and defensive when necessary. Maybe it is commitment, because mother bears dedicate years to raise a single litter. Perhaps it is sacrifice, since mother bears provide cubs with time and energy that could otherwise serve to promote her own physical health.

We’re fortunate to watch many different female bears at Brooks River in Katmai National Park. Yet there is one whose maternal efforts are legend. One who can fish successfully almost anywhere. One whose fearsome reputation is long-lived among other brown bears, including large adult males. Don’t get in her way. Don’t lurk near her fishing spot. Don’t look at her cubs. Do give 128 Grazer your 2023 Fat Bear Week vote.

Early and late summer photos of 128 Grazer. Photo on left is Grazer on July 8. She is facing left and walking through water. Photo on right is from September 14, 2023. She is facing left and standing in belly deep water. She is round.

Grazer | ɡrāzər |

  • (2005 – Present) A female brown bear documented to use Brooks River in Katmai National Park, Alaska. Also known as bear 128.
  • verb. [with object]
    The effort of a mother bear to maul or attack another bear with little provocation, especially in defense of her cubs: She grazered him.
  • Origin: Bear cam slang. Circa late 2010s and early 2020s.

Grazer is famous among people and (maybe) infamous among brown bears for her extraordinary defensiveness. When she arrived at Brooks River in 2016 with three cubs representing her first known litter, she would confront and attack other bears with little or no provocation. Sometimes it appeared that another bear only had to look in her family’s direction to draw her ire, as bear 83 knows well. 

Her behavior didn’t mellow when those first cubs grew into yearlings the following summer. Nor did she rethink her aggressiveness toward other bears when raising her second litter. While mother bears can change their parenting strategy as they gain skill and experience, Grazer continued on the path forged with her first litter—the best defense is a good offense.

Grazer separated from her most recent litter at the beginning of summer 2023. Since then, she’s lived a brown bear bachelorette’s life. Her pheromones attracted the attention of male bears during the mating season. They chased her tail, with varying degrees of success, right bear 164? After the mating season, and also during it, she focused on eating. A lot. Her waistline carries the weight of her success.

Grazer’s formidable reputation carried into this summer. She ranked high in the hierarchy among bears and was perhaps the river’s most dominant female. Notably, 151 Walker deferred to her frequently in early summer. Walker is a big dude and he’s not shy about displacing bears from preferred fishing spots. Bears have good memories, though. Maybe he had too many bad experiences with her in the past and didn’t want to risk more dangerous confrontations.

In this video, Walker is in full dominance mode as he works to displace another adult male at Brooks Falls. But watch his behavior when Grazer shows up on the boulders above.

And in case you need more examples of Grazer bulldozing bears, here you go. (Watch with sound on for the full effect.)

During my brief time at Brooks River early last summer, I watched bears fish largely without success because the expected salmon run was slow to arrive. Some of the big guys caught some fish. 747, for example, sat at Brooks Falls like he always does and let the fish come to him, but even he wasn’t catching many. Most other bears fared worse. They roamed from one place at the river to another, searching for the few early arriving salmon.

Grazer, though, has practiced—no, perfected—her fishing tactics in many different places. If fish are jumping Brooks Falls, she’ll catch them there. If there’s space in the waterfall’s far pool, she’ll catch them there. She’ll work the jacuzzi below the falls. She’ll fish in the middle of the night. She’ll use her strength and agility to chase down salmon. 

One evening last summer, I stood on the riffles platform watching her work the river in front of me. While the riffles provides brown bears with fishing opportunities, it is often a more challenging place for bears to catch salmon than the falls. The riffles doesn’t provide the same pinch points in topography as the falls and salmon have many escape routes. There aren’t many bears who can make the best of that situation consistently, especially when few salmon are in the water and bears are forced to run through the water to get them.

Grazer parks herself on the near bank upstream of me. She moves into the water after several minutes and spots a lone salmon. She lunges and misses. She chases. Another lunge, another miss. She continues running at full speed through the water while somehow keeping an eye on the salmon. With a final lunge, she fully submerges into a two to three-foot-deep pool and surfaces with the salmon in her jaws. I can see the fish gasping in the air as blood runs from deep puncture wounds in its body. Grazer eats all of it—tail to head—even the gill plates and mandibles.

In early summer when few bears were catching salmon, Grazer found success. She is perhaps the best angler at Brooks River. 

Brown bear standing in river. Water is flowing over boulders forming riffles. Bear is moving in direction of camera. Water drips off her fur. She holds a sockeye salmon in her mouth.
Bear 128 Grazer with a catch in the riffles on July 6, 2023.

Let’s not lose sight of Grazer’s goals either. She’s working to build the fat reserves necessary to sustain her survival during winter hibernation. She’s also building fat in case she gives birth in the den. Bear cubs are born mid winter while mother hibernates. Abundant fat reserves are necessary for mother bears to reproduce, so getting fat is vital to a bear’s reproductive success.

In a way, my 2023 Fat Bear Week endorsement is a recognition of Grazer’s full-bodied and fat-addled collection of work since 2016. When she is raising cubs Grazer is the archetypal mama bear. She’s formidable, strong, brave, skilled, and  successful. She deserves your vote in Fat Bear Week 2023.

Fat Bear Week bracket. Four bears (806 cub vs 428; 402 vs 901) in two first round matches on left. Two bears (32 and 480) are in bye round on left. Four bears (128 Grazer vs 151; 284 vs 164) in two first round matches on right. Two bears (747 and 435) are in bye round on right. Graphical cartoon bears fill the top and bottom center of the bracket.
My Fat Bear Week bracket predictions for 2023. Yes, yes, I know. I don’t predict that Grazer will win. There’s a difference between who I think should win and who I think will actually win, after all. Which bear’s corner are you in? Download your bracket from FatBearWeek.org.

Fitz’s Fat Bear Week 2022 Endorsement

/ Mike Fitz / 11 Comments

As is tradition—going way back to the before times (2017)—I’ve endorsed a bear for Fat Bear Week. This year’s bracket might be difficult to predict, but with voting commencing today at 12 p.m. Eastern and continuing through October 11, it’s time to throw my weight behind a Fat Bear Week contender. 

I’d let him speak for himself but his mouth is usually too full of salmon.

Friends, humans, and ursids, let us stand in awe of a true competitor. A candidate with conviction. A candidate with strength. A candidate that stands up for what he believes. A candidate the size of a double-wide refrigerator. This Fat Bear Week vote for the mighty 747. 

747 returns to Brooks River every summer as a giant and just keeps getting bigger.

Two photos of same bear, 747. Top photo is a bear standing facing left with medium-brown fur and wounds on his right ear. Bear is facing right. Photo taken on June 25, 20222. Bottom photo is a dark brown and fat bear standing in shallow water facing right. Photo taken September 6, 2022.

Perhaps you don’t want to listen to me. After all, I’ve endorsed 747 before and it hasn’t usually led to his victory. Our culture is celebrity obsessed, though, so maybe you’ll listen the expert opinions of these randos. 

Homer remarked that 747 is the only other individual whose blubber flies like his.

GIF of shirtless Homer Simpson walking on beach wearing red speedo. Woman on chair yelps when she sees him.

Pee Wee Herman agreed that 747 was the fattest bear, but he was incredulous when Amazing Larry said he might vote for another candidate.

GIF. Pee Wee Herman yells at man with mohawk, "You're not going to vote for another bear are you?!?" Man looks at Pee Wee with alarm.

large brown bear stands in shallow water at the base of a waterfall. He's facing directly toward the photographer.r at
*Stares in 747*
National Park Service / L. Law

Dr. Evil threatened world destruction if 747 fails to win.

GIF of Dr. Evil from movie Austin Powers. Camera zooms in on his face while text says, "Vote for 747

I spoke with the President too, believe it or not. (He seems to clear his schedule when you have something to say about Fat Bear Week.) Joe Biden noted that 747 grew proportionally faster than this year’s inflation rate. 

GIF of Joe Biden at podium looking surprised.

747’s summer was one of competition and success. In June and July, he yielded space to bear 856. By August, however, 747 turned the tables. He frequently challenged and displaced his long-time rival. 

It’s hard work staying dominant and getting fat too. Bears as large as 747 tend to overheat easily, and while their limb bones are built to support their great mass sometimes climbing those hills is a struggle.

You also can’t get that fat without eating a lot of food, and 747 excels in this life goal. Although we don’t know exactly how many fish 747 ate this year, a study about brown bears on Kodiak Island may provide some insight. 

Brown bears shed their fur once per year in early to mid summer. Since new fur grows during a bear’s active season, it contains a record of what the bear ate during that time. Studies of captive bears had previously determined the relationship between the mercury content in food and the mercury content in hair. To apply this to bears on Kodiak, researchers first determined how much mercury is found in the Pacific salmon that spawn on Kodiak. They then analyzed the mercury content found in the bears’ hair to gain an estimate of salmon consumption. Large adult males, on average, ate 6,146 pounds (2,788 kg) per bear per year! Some adult males ate a lot more, though, as much as 10,000 pounds of salmon. Since 747 fished at Brooks Falls almost every day between late June and mid September this summer, then his total salmon consumption may likely have been near the upper end of that spectrum.

For fisheries managers and biologists, these statistics are more than pieces of trivia. They are necessary to help inform decisions about salmon escapement goals, so that salmon runs are sustainable for people and the wildlife who depend on them. The aforementioned Kodiak study found that “the estimated population of 2,300 subadult and adult bears [on Kodiak] consumed 3.77 million kg of salmon annually, a mass equal to ~6 percent of the combined escapement and commercial [salmon] harvest (57.6 million kg).” Katmai National Park’s bear population is about as large as Kodiak’s, and when we work to sustain salmon runs we’re also celebrating the life they provide to many other species and individuals, such as bear 747.

Bears get fat to survive winter hibernation, and Katmai National Park’s Fat Bear Week bears are well positioned to weather the oncoming famine. But there’s candidate who eclipses the rest. Your bear might be a 10 but 747 is 1,400 pounds. I’m voting for 747, are you? 

GIF of Captain Kirk and Dr. McCoy nodding in agreement.

Download your bracket from FatBearWeek.org and go there to vote in each Fat Bear Week match from October 5 to 11.

THE THING ABOUT BEARS IS THAT A LOT OF THEM ARE BIG. BUT LIKE HAVE YOU SEEN 747?? HE’S SO BIG. A GIANT, REALLY. HE JUST SITS THERE AND FISHES LIKE THERE’S NO TOMORROW. I MEAN HE HARDLY LEFT THE FALLS ALL SUMMER. DOESN’T MATTER HOW COLD THE WATER IS OR WHICH OTHER BEARS ARE THERE….

teenage girl talks loudly into the ear of a teenage boy. Boy does not look amused or interested.

Cultivating Mass: 2021 Fat Bear Week Endorsement

/ Mike Fitz / 16 Comments

Life as a champ is rough. Rivals look to take advantage of any weakness you might show. Arm chair critics analyze your every move. Fans expect perfection. When the next championship tournament rolls into town your body has aged another year and your preferred food has worked its hardest to evade and escape you. Meanwhile, you’re trying to live your best life, because you are a bear and the concerns of humans matter not to you.

Yet, for those of us who recognize greatness and celebrate success when we see it, there is one clear choice for Fat Bear Week 2021—the mighty 747.

before and after photos of a large brown bear. Top photo was taken on July 4 2021. Bottom photo was taken on September 14 2021.

Long-time readers of this blog may be thinking, “This again?”

photo of man leaning close to a woman's ear to talk to her. Woman stairs ahead with a bored look. Text reads in all caps, "SO HAVE I TOLD YOU ABOUT 747? LIKE HE’S THE BIGGEST BEAR AND EATS SO MANY SALMON. LIKE SO MANY SALMONS. IS IT SALMON OR SALMONS? I'M FUNNY, RIGHT? ANYWAY, I BET YOU’VE NEVER THOUGHT ABOUT HOW MANY SALMONS A BEAR CAN EAT, BUT…"

…Let me tell you dear friends: 747 is as fat as ever.  He deserves your Fat Bear Week vote.

Brown bears get fat to survive. Their obesity (and it is that since a bear’s body fat percentage is routinely 20-30 percent or more when they begin hibernation) is a savings account. In the den, bears do not eat or drink. They stay warm and hydrated by burning body fat. Unlike utilizing muscle for energy—a process that produces metabolic wastes that must be recycled, sequestered, or purged from the body—burning fat is a relatively clean fuel as I write in chapter 4 of my book, The Bears of Brooks Falls.

screen capture of text that reads, "Bears survive the hibernation period because they got fat beforehand. Metabolizing body fat produces metabolic water, heat, and carbon dioxide. The carbon dioxide is absorbed into the bloodstream and exhaled normally through the lungs, while the heat and water are used for warmth and hydration. A bear also minimizes its body’s demand for water by adhering to strict water- conservation principles. Physical movements are limited, so cells don’t become thirsty like they would in a more active mammal. Their kidneys produce little urine, which is soon reabsorbed by the bladder. In this way, fat metabolism produces enough metabolic water to keep bears hydrated. Water lost to the environment is primarily through exhaling. Hibernating bears in captivity will even ignore water provided to them."

It’s akin to cultivating mass only to carefully harvest it later. Just not for vanity’s sake, bro.

747 cultivates mass at an exceptional rate. This summer, he reigned as Brooks River’s most dominant adult male. Even the river’s long-time dominant bear, 856, would not challenge him, and as a result 747 had nearly free access to any fishing spot of his desire.

A single brown bear can eat thousands of pounds of salmon per year. The largest can eat 6,000 to 10,000 pounds. Given his size, appetite, high rank in the bear hierarchy, and his keen fishing skills, 747 is more than capable of eating many thousands of pounds of salmon each summer. At Brooks Falls, he intercepts a great deal of fish by being at the right place at the right time and waiting for his food to come to him. When Brooks River’s sockeye migrated upstream, 747 was primed to harvest them.

GIF of bicycle crash. Woman who holds sign that causes crash represents 747. Peloton represents salmon.

He’s so successful that in September 2019 and again in September 2020, he was estimated to weigh more than 1,400 pounds. This places him, as I estimate, among the top one percent of brown bears based on body mass.

Even with his size, he remains agile.

Well, maybe not always that agile.

When he walks close to the webcams at Brooks River, he eclipses the sun.

And yes, that is a tapeworm hanging on for a ride.

Fat Bear Week celebrates the success of Brooks River’s bears, the ecosystem and salmon that sustain them, and the bears’ abilities to get fat and survive. 747 exemplifies success among adult male brown bears. He deserves your vote and a repeat Fat Bear Week victory.

Four panel meme from Star Wars. Text in panel 1 says, "I'm voting in Fat Bear Week." Text in panel 2 says, "You're voting for bear 747?" No text in panel three, just a stoic face. Text in panel 4 says in smaller text, "You're voting for bear 747?"
photo of man leaning close to a woman's ear to talk to her. Woman stairs ahead with a bored look. Text reads in all caps, "BEARS GET FAT TO SURVIVE. DID YOU EVER CONSIDER THAT? I MEAN NOT A LOT OF PEOPLE THINK ABOUT THAT, RIGHT? MAYBE IF YOU THINK THAT’S COOL WE COULD HANG OUT ON FATBEARWEEK.ORG AND VOTE FOR 747."

Join explore.org’s Fat Bear Week live events, fill out your bracket, vote for your bear in Fat Bear Week. See you on the campaign trail.

Title: Fat Bear Week 2021 Bracket. 12 bears, six on each side. Four first round matches and 4 bears that get a bye into the second round. Winners are chosen. 747 is predicted to win.
My 2021 Fat Bear Week bracket leads to a 747 victory. Get in his corner before it is too late.
GIF of large brown bear looking intensely in direction of camera

2020 Fat Bear Week Endorsement

/ Mike Fitz / 10 Comments

In a year of heightened political polarization, there’s one candidate that rises above the rest. He’s a candidate for greatness. A candidate for change. He campaigns on a platform of success, skill, efficiency, and hard work. He is known simply as 747 and he deserves your vote for Fat Bear Week.

Large brown bear seated in shallow water.

Seven-four-seven is a titan, a tank, and a giant among bears. Holly might pledge a “salmon in every paw,” but 747 pledges just to eat salmon.

Seven-four-seven’s size is legend. At the Brooks River, few bears approach his size class, and as a result he has consistently ranked among the river’s most dominant bears. His measured size even surprised me, however. Through a novel use of terrestrial laser scanning technology, he was estimated to weigh more than 1,400 pounds in September 2019. This summer he appears to be at least as large, but I suspect he’s even bigger.

A bear can’t get this big without eating a lot of food, and Brooks River provides 747 with ample opportunity to get fat. Brooks River is part of the Bristol Bay watershed, an area that supports the last great salmon run on Earth. While salmon runs throughout much of North America struggle to cope with the combined impacts of impassible dams, incompatible land-use changes, and climate change, Bristol Bay continues to support tens of millions of salmon each year. Almost 58 million fish collectively returned to Bristol Bay in 2020, and the salmon run in the Naknek River watershed was exceptional. More than four million sockeye swam up the Naknek River between mid June and late July. The Naknek drainage may have supported the largest single salmon run on Earth this year. About twenty percent of those salmon–maybe 800,000 fish–entered Brooks River.

At Brooks Falls, 747 sat or stood waiting for his meals to come to him. He consistently capitalized on the vulnerability of salmon in the shallow, bubble-filled water. For a winter hibernator like 747, an individual who must eat a year’s worth of food in fewer than six months to survive, efficiency is a valuable trait to express.

Some pundits have called my support for 747 unwavering. Yet, I’m always on the lookout for a better candidate. This year, however, I’ve failed to find evidence of another Fat Bear Week contender that is fatter than 747. Whether you look at fatness as a proportional measure of body size or just through overall size, 747 has both bases covered.

A police department in Colorado even mistook 747 for a large boulder the size of a small boulder.

One person [who I am married to but will go unnamed] has maybe jokingly called me the “worst campaign manager ever,” because my candidate never wins. She might be correct. Despite my prior lobbying efforts, 747 has yet to win Fat Bear Week. Over the last several years, 747 has been snubbed by the voting public who viewed competitors like Otis, Lefty, Beadnose, and Holly as proportionally fatter.

But mark my words, dear readers. This is 747’s year. Cast your Fat Bear Week vote for the bear who shares an identification number with a jet airplane.

GIF of Hulk Hogan and other wrestlers signaling "for life" with hand signals.
Fat Bear Week 2020 bracket. It lists six bears on the left and six on the right. The logos at the bottom represent explore.org, Katmai National Park, and the Katmai Conservancy.
Here are my 2020 Fat Bear Week bracket predictions. Download your own 2020 Fat Bear Week bracket on fatbearweek.org and vote in the tournament from September 30 through October 6. Watch the bears on explore.org.

Fat Bear Week 2019 Endorsement

/ Mike Fitz / 11 Comments

Avoiding the news when your job is internet-based is like avoiding the flu when your entire household is infected. So, try as I might, I keep stumbling upon headlines about upcoming presidential primary elections. The big question on the minds of pundits seems to be, “Will people choose the candidate who best represents their values or the one who they think is most electable?”

As a certified bearcam aficionado and well-known Katmai National Park pundit, I am pleased to announce that I have do not have that issue, at least not for the upcoming “election” called Fat Bear Week. My candidate isn’t a compromise between values and electability. He’s the real deal, the one, the only, the titanic bear known as 747. He deserves your vote.

silhouette of fat bear sitting in river

Don’t you call me pudgy, portly, or stout. Just now tell me once again, who’s fat? (NPS photo of bear 747 by N. Boak)

Seven-four-seven is a giant among bears, an adult male in the prime of his life who uses his size to dominate access to his preferred fishing spots in the jacuzzi and the far pool. His experience and skill pay off each fall, supplying 747 with the substantial fat reserves necessary to survive winter hibernation without eating or drinking.

To get this fat, you need to catch and eat a lot of salmon. Adult brown bears on Kodiak Island consume can consume an incredible 6,146 pounds (2,788 kg) of salmon per bear per year! Given 747’s excellent fishing skills and ability to routinely access the most productive fishing locations at Brooks Falls, I have no doubt his salmon consumption is on par with the biggest Kodiak bears. Stuck in his own version of “feed”-back loop, 747 gets fatter and fatter until it’s time to enter the den. (And, no bears probably can’t get too fat.)

If you don’t believe me about 747’s qualifications, believe the Internet, always an impartial repository of truth and honesty. In 2017, I recorded a video of 747 in all his epic fatness. If anything can be gleaned from viewer comments (and of course we know that YouTube comments represent the highest form of public discourse), 747 is an extra THICC absolute unit who is ready to hibernate through two winters.

The people have spoken.

At Brooks Falls, 747 remains quite dominant and can often access any fishing spot he chooses, which is not surprising given his size. Adult males typically rank at the top of the bear hierarchy. Even so, 747 still faces competition, in real life and in Fat Bear Week. This summer, I was awestruck watching 747 clash with another adult male, 68, in an intense fight.

 

Sixty-eight emerged victorious in the battle, not only securing access to a preferred fishing spot at Brooks Falls but also assuring his dominance over 747. Bloodied from the fight, 747 left the falls area almost immediately and I thought I might not see him for the rest of the evening.

bear standing in water with some blood dripping from his lower lip

747 bleeds from the mouth after his fight with 68 on July 2, 2019.

Within an hour or so, he returned and began fishing like nothing happened. When you only have a few months to prepare for winter hibernation, there’s little time to waste.

Like so many things in life, 747’s Fat Bear Week victory is not guaranteed. My 2017 and 2018 endorsements for 747 were followed by his sound defeat. This year, his competition is just as fat if not fatter.

GIF of bear sitting upright and scratching an itch with her left front paw

Dear Holly,

Game on. See you in the Fat Bear Week finale!

Sincerely,
747’s Campaign Manager

Your Fat Bear Week vote can be based on any number of factors. You can consider a bear’s annual overall growth like that experienced by cubs and subadult bears. Perhaps you want to weight your vote toward bears with extenuating circumstances such as a mother’s cost of raising cubs or the additional challenges older bears face as they age. No matter what though, 747 once again offers you, the astute Fat Bear Week voter, the opportunity to support a bear who is both the fattest and the largest, two traits that are not mutually exclusive.

Complete your civic duty and vote for Brooks River’s fattest bear from October 2 – 8 on Katmai National Park and Preserve’s Facebook page. Look for the head-to-head Fat Bear Week matchups. The bear whose photo receives the most “likes” advances to the next round, until one bear is crowned fattest bear on Fat Bear Tuesday, October 8. Don’t forget to watch Katmai’s fattest bears every day on explore.org.

Fat Bear Week 2019 Bracket.jpg

Fat Bear Week 2018 Endorsement

/ Mike Fitz / 16 Comments

Last October I wrote, “There are small and fat bears, old and fat bears, young and fat bears, and just plain fat bears. But none, NONE I say, are as fat as 747.” A year later, 747 continues to demonstrate his survival skills and success at Brooks River. He’s big enough and fat enough to once again earn my official endorsement for Fat Bear Week 2018. 747 is titanic, a giant among bears.

GIF of large, dark brown bear walking down a steep hill

Bear 747 is an adult male in the prime of his life. First identified as a subadult bear in 2004, he’s matured into the largest bear I’ve ever seen.

 

747 on July 5, 2018.
747 on September 10, 2018.

But don’t just take my word for it. Bear 747 is endorsed by several of his competitors at Brooks River.

bear lying on ground

“Look, we’re all fat right now, but no one is as fat as 747. Seriously, his belly nearly drags on the ground. Even I never achieved that level of pudge. “ Bear 410

profile of bear walking along edge of river

“I keep my distance from him because I’m concerned he’ll roll on top of me.” Bear 68

402_07062016

“I’m still in awe of his size. Can he even dig a den big enough to fit within?” Bear 402.

bear with blond ears and blond coat standing in water

“Even though I’m in the Fat Bear Week bracket, I still might vote for 747. It’s the logical vote. He probably weighs at least three times as much as me.” Bear 719

profile of brown bear standing on edge of waterfall

“747 is a role model of fat bear success. I hope to be as fat as him one day.” Bear 503

bear sitting in water below waterfall

“I’m too hungry to comment.” Bear 480 Otis.

Many people who have observed 747 closely also agree with the endorsement.

bear lying in water facing photographer

“He’s all business—fishing and eating. Nobody gets fat like 747.” Jeanne R., former Katmai National Park ranger.

Too much fat is unhealthy for humans, but fat is essential to the survival of brown bears. It is a savings account against famine. Without ample fat, bears do not survive hibernation. In spring, often a season of starvation for bears, females with cubs will metabolize fat into milk to nurse their growing cubs, and adult males will use their fat to fuel their pursuit of mates.

747 won’t be rearing any cubs next spring as male brown bears play no role in raising offspring. During a season when almost no high calorie foods are available to bears, 747 will use his fat to roam the landscape for mates instead.

Other bears might be more charismatic or tug on your heartstrings, but 747 truly is a giant among Brooks River bears. He deserves your vote for Fat Bear Week 2018.

Katmai Fat Bear Week Bracket 2018 Fitz choices.png

My 2018 Fat Bear Week bracket predictions.

You are encouraged to vote for Brooks River’s fattest bear on Katmai National Park and Preserve’s Facebook page. Starting on Oct. 3, park rangers will post head-to-head matchups between well-known bearcam bears. The bear whose photo receives the most likes will advance to the next round, until one bear is crowned fattest bear on Fat Bear Tuesday, October 9th. Don’t forget to watch Katmai’s fattest bears on bearcam.

 

 

 

What is Hyperphagia?

/ Mike Fitz / 3 Comments

Side-by-side comparison of bear in late spring and late summer. Text reads, "747 June 13, 2107" "747 September 11, 2017"

Photos of bear 747 from late spring and late summer illustrate this bear’s substantial weight gain. Photos courtesy of Katmai National Park.

As we’re in the midst of Fat Bear Week, it’s a good time to ponder some of the mechanisms that allow bears to gain enough weight to survive hibernation. Bears get fat to survive and hyperphagia is how they do it. In the bearcam week in review for October 5, I briefly explained hyperphagia. Here it is in case you missed it.

Bears experience hunger in ways humans do not. They need to eat a year’s worth of food in six months or less to survive winter hibernation and the lean months of spring. To do this they eat A LOT, especially at this time of the year. 

In bears, hyperphagia is the period of excessive eating which takes place in late summer and fall. During this time black bears will eat 20,000 calories of food per day. Katmai’s brown bears can easily eat even more by catching calorie-rich salmon. Even though their calorie intake is extremely high, hyperphagic bears don’t feel full.

Satiety is the feeling of fullness after a meal. During hyperphagia, a bear’s body temporarily suppresses the normal mechanisms that balance food intake with weight gain. The body says, “You aren’t full. You don’t have enough fat reserves and need to eat more.” In short, hyperphagic bears don’t feel sated. This contrasts with the excessive eating of bears in June and July when they are eating a lot, but their bodies probably still respond to a feeling of fullness (which is sometimes hard to believe when you watch Otis or 747 catch fish after fish after fish). Hyperphagia, therefore, is a physiological state of bears in late summer and fall, as much as it is a behavior we can see. It’s how they prepare to survive the famine ahead.

747 should be your choice for Fat Bear Week

/ Mike Fitz / 18 Comments

There are small and fat bears, old and fat bears, young and fat bears, just plain fat bears. But none, NONE I say, are as fat as 747 in 2017. He has earned my official endorsement in the 2017 Fat Bear Week tournament.

fat bear walking in shallow water near grass

747 displays his massive silhouette near Brooks Falls on September 6, 2017.

747 is a mature adult male in the prime of his life. He has gained at least as much and probably more weight than all others. In my opinion, 747 is the biggest and fattest at Brook River.

Compare 747’s overall size in late spring…

Large brown bear

747 in mid June 2017. Photo courtesy of David Kopshever.

…with his fatness in early September.

Fat bear walking in grass

747 is so fat, his belly almost touches the ground.

Still not convinced? Then watch this video of 747 from September 6, 2017.

Since then, 747 has gained even more weight.

Too much fat is unhealthy for humans, but fat is essential to the survival of brown bears. It is a savings account against famine. Without ample fat, bears do not survive hibernation. In spring, often a season of starvation for bears, females with cubs will metabolize fat into milk to nurse their growing cubs, and adult males will use their fat to fuel their pursuit of mates.

747 won’t be rearing any cubs next spring as male brown bears play no role in raising offspring. During a season when almost no high calorie foods are available to bears, 747 will use his fat to roam the landscape for mates instead.

747 faces some tough competitors in this year’s tournament, but don’t fall for any other fat bear propaganda from the fake news mainstream leftwing socialist progressive liberal media. 747 is larger and fatter than any other bear at Brooks River. He’s huge, tremendous, and will win “bigly.”

2017 Fat Bear Week bracket with 747 as champ

This is my 2017 #FatBearWeek bracket. I look forward to seeing your bracket and campaign posters in the bearcam chat on explore.org.