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Polar Bears - Data, Pictures and Videos
Polar Bears - Data, Pictures and Videos
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Polar Bears - Data, Pictures and Videos
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  *This image is copyright of its original author Polar Bears Proceedings of the Twelfth Working Meeting of the IUCN/SSC Polar Bear Specialist Group, 3-7 February 1997, Oslo, Norway books.google.com.ar/books?id=H5hjuhGwfDoC&pg=PA70&dq=polar+bear+specimen+measurements&hl=en&newbks=1&newbks_redir=0&source=gb_mobile_search&sa=X&ved=2ahUKEwjjoqPymY6JAxUaqJUCHTC1MiI4ChDoAXoECAUQAw#v=onepage&q&f=false  *This image is copyright of its original author https://books.google.com.pk/books?id=dJg...ar&f=false  *This image is copyright of its original author  *This image is copyright of its original author "JIM BROOKS AND HIS COMPANIONS EMPLOY A HELICOPTER TO OBTAIN THE WEIGHT OF EACH SPECIMEN"
http://www.livescience.com/polar-bears-b...lders.html
Polar bears bash walrus skulls with boulders and ice blocks, study suggests. Picture a polar bear stalking an unsuspecting walrus in the frozen Arctic: The predator slowly inches closer, camouflaged by ice and snow, until it's close enough to pounce. And then it delivers the killing blow — by bopping the walrus on the head with a large rock. That might sound like something you'd see in a cartoon, rather than in nature. But for centuries, Inuit people in the Arctic have shared such stories with non-Native explorers and naturalists, describing polar bears killing or stunning prey with stones and chunks of ice that the bears grasp in their paws (or throw off cliffs onto animals at the bottom, according to a memorable 19th-century engraving). A new study looked at Inuit anecdotes describing this behavior — "from a diversity of locations and over a long period of time" — and found they were so widespread and consistent that they suggested that in rare cases, polar bears likely wield such objects as weapons. However, until scientific researchers actually catch the Arctic bears in the act of bludgeoning walruses, it's hard to say for sure.
A peek into polar bears’ lives reveals revved-up metabolisms.
In a world with declining Arctic sea ice, that could be a problem  *This image is copyright of its original author BEARS ON ICE A study that put camera collars on polar bears showed that the bears have higher springtime metabolic rates than previous estimates. Female polar bears prowling springtime sea ice have extreme weight swings, some losing more than 10 percent of their body mass in just over a week. And the beginnings of bear video blogging help explain why. An ambitious study of polar bears (Ursus maritimus) in Alaska has found that their overall metabolic rate is 1.6 times greater than thought, says wildlife biologist Anthony Pagano of the U.S. Geological Survey in Anchorage. With bodies that burn energy fast, polar bears need to eat a blubbery adult ringed seal (or 19 newborn seals) every 10 to 12 days just to maintain weight, Pagano and his colleagues report in the Feb. 2 Science. Camera-collar vlogs, a bear’s-eye view of the carnivores’ diet and lifestyle secrets, show just how well individual bears are doing. The study puts the firmest numbers yet on basic needs of polar bears, whose lives are tied to the annual spread and shrinkage of Arctic sea ice, Pagano says. As the climate has warmed, the annual ice minimum has grown skimpier by some 14 percent per decade (SN Online: 9/19/16), raising worries about polar bear populations. These bears hunt the fat-rich seals that feed and breed around ice, and as seal habitat shrinks, so do the bears’ prospects. Pagano and colleagues used helicopters to search for polar bears on ice about off the Alaska coast in the Beaufort Sea. It’s “a lot of grueling hours looking out the window watching tracks and looking at whiteness,” he says. After tracking down female bears without cubs, the researchers fitted the animals with a camera collar. A full day’s doings of bears on the sea ice have been mostly a matter of speculation, Pagano says. Collar videos showed that 90 percent of seal hunts are ambushes, often by a bear lurking near a hole in the ice until a seal bursts up for a gulp of air. Videos also caught early glimpses of the breeding season and what passes for courtship among polar bears. Males, Pagano says, “pretty much harass the female until she’ll submit.” The researchers also injected each bear with a dose of water with extra neutrons in both the hydrogen and oxygen atoms. Eight to 11 days later, the team caught the same bear to check what was left of the altered atoms. Lower traces of the special form of oxygen indicated that the bear’s body chemistry had been very active, and that the bear had exhaled lots of carbon dioxide. (The unusual form of hydrogen let scientists correct results for oxygen atoms lost in H2O, for instance when the bear urinated.) Using CO₂ data from nine females, Pagano and his colleagues calculated the field metabolic rates for polar bears going about their springtime lives. The team found that female bears need to eat a bit more than 12,000 kilocalories (or what human dieters call calories) a day just to stay even. That estimate adds some 4,600 kilocalories a day to the old estimate. But merely maintaining weight isn’t enough for a polar lifestyle. To survive lean times, polar bears typically pack on extra weight in spring. To get a broader view of the bears’ energy needs, similar metabolic measurements for other seasons would be useful, says physiological ecologist John Whiteman of the University of New Mexico in Albuquerque. That could help resolve whether and how much bear metabolism drops when there’s little food, a response that might protect bears during hard times. Using temperature loggers to estimate metabolic rates, he has seen only a gradual decline in metabolic rates in summer as food gets tougher to find. Winter metabolic rates remain a mystery. Hunting success and bear activity are only part of the picture of polar bear health, says ecotoxicologist Sabrina Tartu, of the Norwegian Polar Institute, which is based in Tromsø. Tartu coauthored a 2017 paper showing that toxic pollutants such as polychlorinated biphenyls, or PCBs, can build up in bear fat. Such “pollutants could, by direct or indirect pathways, disrupt metabolic rates,” she says. So changing the climate is far from the only way humankind could affect polar bear energy and hunting dynamics. https://www.sciencenews.org/article/peek-polar-bears-lives-reveals-revved-metabolisms#:~:text=An%20ambitious%20study%20of%20polar%20bears%20%28Ursus%20maritimus%29,Pagano%20of%20the%20U.S.%20Geological%20Survey%20in%20Anchorage.
This here should be the second largest weighed polar bear that we have on record (scientifically) after Stan the 1800 pound polar bear. The scientists captured the polar bear in Alaska: 110 stone (698.53 kg.....1540 lbs)
Q: How do you measure a 110-stone polar bear? A: Very carefully!  *This image is copyright of its original author 1. Alert to the intruders: The polar bear spots the research team  *This image is copyright of its original author 2. Bullseye: The team hit their target and the 110-stone polar bear falls to the ice  *This image is copyright of its original author 3. It's a knockout: A few minutes after being struck, the bear is unconscious  *This image is copyright of its original author 4. Lengthy: The researcher measures the length of the male bear  *This image is copyright of its original author 5. Hoisted: The bears is weighed with a special block and tackle  *This image is copyright of its original author 6. Big head: A skull measurement is taken  *This image is copyright of its original author 7. Marked: The bear's lip is tattooed for identification https://www.dailymail.co.uk/news/article...fully.html
https://https://youtube.com/shorts/IPg7Ietwi2g?si=tmn37_W87DI1_Y9D
The polar bear knows where to bite instinctively (by bear standards). |
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