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Post by OldGreenGrolar on Nov 16, 2022 16:13:10 GMT -5
/\ But these polar bears are nowhere near as large as the Foxe Basin polar bears. The polar bears in that video at 1200 pounds are considered large. Anyway, I guess it takes a while before the polar bears get used to the more aggressive grizzlies.
Grizzlies get their aggression from living among many predators in the past and also because they do not climb (when they reach a certain age and weight), forcing them to fight rather than flee.
American Black bears being the better climbers are not as aggressive.
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Post by brobear on Nov 17, 2022 1:01:29 GMT -5
/\ But these polar bears are nowhere near as large as the Foxe Basin polar bears. The polar bears in that video at 1200 pounds are considered large. Anyway, I guess it takes a while before the polar bears get used to the more aggressive grizzlies. Grizzlies get their aggression from living among many predators in the past and also because they do not climb (when they reach a certain age and weight), forcing them to fight rather than flee. American Black bears being the better climbers are not as aggressive. Those polar bears are roughly triple the weight of the barren ground grizzlies. Again, I'm not saying that an adult male polar bear cannot kill a barren ground grizzly. But, the polar bear's natural fear of the unknown is real. The grizzlies are infamous for their aggressive behavior. For the polar bears, avoidance came easier than accepting a challenge from something strange and unknown to them.
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Post by OldGreenGrolar on Nov 17, 2022 1:22:52 GMT -5
/\ Still the polar bears are aggressive during mating season. However, you are right, living an isolated life makes them nervous around the unknown.
Still polar bears are able to intimidate black bears (despite seeing one for the first time). That says something about grizzly aggression.
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Post by OldGreenGrolar on Nov 17, 2022 5:31:25 GMT -5
As seen in the DC documentary, the presence of the grizzly bear caused about one-third of the polar bears to exit but there were a majority two-thirds who remained (they were the larger older males). wildfact.com/forum/topic-polar-bears-data-pictures-and-videos?page=16anyway I got the article form Ava originally posted by Warsaw. I reposted it on Wildfact post 236 but the link is no longer active ☹️.
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Post by OldGreenGrolar on Nov 17, 2022 6:37:44 GMT -5
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Post by brobear on Nov 17, 2022 6:48:13 GMT -5
Interesting... Polar bear and brown bear hybrids are more climate resilient. Polar bears and brown bears have been mating in Russia and producing hybrid cubs that are more resilient to climate change. Evidence of the species, known as 'Brolar bears' or 'Pizzlies', has been found in the United States and Canada in the past. However, brown bears are now also being spotted in the Russian Far East where polar bears live, prompting experts to think hybridisation could soon occur. Brolar bears are known to be more suited to warmer temperatures than polar bears, as they do not rely so heavily on sea-ice for hunting like their polar bear relatives. These hybrid bears have a mostly white coat, with a brownish hue and a nose that is a cross between a polar bear and a brown or grizzly bear. Polar bears survive on a specialised diet of blubber, and use sea-ice to hunt for seals. Many studies have confirmed that Arctic ice cover is depleting, making it more difficult for them to get the nutrition they need. As a result of the changing terrain, polar bears have been known to be making their way inland in search of more food. The warming climate has also meant that brown bears have been able to venture further north to hunt, and the two species encounter each other as their habitats overlap. As a result, the bears have been birthing hybrid cubs, and were first seen in the wild in 2006. The Republic of Sakha, or Yakutia, is home to the Laptev and Chukchi-Alaska polar bear populations. In surveys taken in October, scientists found that there are about 60 polar bears living in the region, which are being protected as part of the Bear Islands Nature Reserve. Dr Innokentiy Okhlopkov, a biologist at the Siberian Branch of the Russian Academy of Sciences (SBRAS), told Russian news agency TASS about increasing brolar bear prevalence. She said: 'Brown bears are moving into the tundra. Brown bears have been seen in the lower reaches of the Kolyma River, where polar bears live. 'Brown bears have been seen, for example, in the Anabar District. It is likely that in the future there will be hybrids of polar and brown bears.'
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Post by brobear on Nov 17, 2022 6:51:03 GMT -5
Polar bears survive on a specialised diet of blubber, and use sea-ice to hunt for seals that come up from the water for air.
Paleontologist Larisa DeSantis at Vanderbilt University said: 'The polar bear and grizzly bear shared a common ancestor 500,000 to 600,000 years ago, but then they diverged.
'Molars of a polar bear are smaller than a grizzly, but their canines are larger. This is because they are essentially eating jello all day, basically blubber.
'But to compensate, polar bears have elongated skulls that are well adapted to effectively hunt seals.'
However, many studies have confirmed that Arctic ice cover is depleting, making it more difficult for them to get the nutrition they need.
This year, Arctic winter sea ice was confirmed by NASA to be at at its tenth lowest on record, and missing an area 40 times the size of Wales
NASA commented: 'These trends are linked to warming caused by human activities such as emitting carbon dioxide, which traps heat in the atmosphere and causes temperatures to rise.'
According to the Institute of Permafrost Studies at SBRAS, the average annual air temperature across Yakutia has grown by 1.26°F (1.1°C) to 38°F (3.4°C) in the last 50 years. As a result of the changing terrain, polar bears have been known to be making their way inland in search of more food.
The warming climate has meant that brown bears have been able to venture further north to hunt, and the two species encounter each other as their habitats overlap.
As a result, the bears have been birthing hybrid cubs, which were first seen in the wild in 2006 when Arctic hunters killed a white bear with brown patches in Canada.
Unlike polar bears, grizzly bears are well adapted to eat hard foods like plant tubers or to scavenge carcasses when resources are limited.
This means that the brolar bears are more able to adapt to a changing diet and climate than polar bears, and could help maintain the polar gene.
However, experts have warned that, as brown bears substantially outnumber their northern cousins, they could 'eat polar bears up, genetically'.
Research has found that shrinking polar habitats is also forcing the species to inbreed, which is the reducing the fertility of the offspring, and into cannibalism.
A 2020 study warned that most polar bear populations are at risk of dying out by 2100 as their natural habitat of Arctic sea ice is diminished by global warming.
They are also at risk from poaching, including trophy hunting, and environment pollution.
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Post by brobear on Nov 17, 2022 6:51:37 GMT -5
Polar bears and brown bears continued to mate with each other long after the species separated Scientists from the USA, Mexico and Finland analysed the genomes of 64 modern polar and brown bears, including several new genomes from Alaska - a state where both species are found.
They produced a new, more complete genome for a polar bear that lived 115,000 to 130,000 years ago in Norway’s Svalbard archipelago from a tooth attached to a subfossil jawbone.
Using this dataset, researchers estimate that polar bears and brown bears started to become distinct species between 1.3 and 1.6 million years ago.
They also concluded that polar bears endured dramatic population decline after they became their own species.
This in turn reduced the variation of the gene pool, and left polar bears with much less genetic diversity than brown bears.
Polar bears ultimately were found to carry a more evidence of DNA from brown bears than the other way round, despite hybridisation from both species.
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Post by brobear on Nov 17, 2022 6:53:44 GMT -5
Note: Take your pick: "Grolar bears, Brolar bears or Pizzlies"...
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Post by Deleted on Dec 15, 2022 5:45:38 GMT -5
*Discussing who will win between an Alaskan Grizzly and a Polar BearThere are other subspecies of Grizzlies - like Kodiak, Kamchatka, Russian Grizzly, etc - but we will be using an Alaskan Grizzly in this fight. I would like to use the Califonia Grizzly but sadly they're extinct.
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Post by Deleted on Dec 15, 2022 5:50:48 GMT -5
The Grizzly will be 8 feet and 1,300 pounds, and the Polar Bear will be 9 feet and 1,340 pounds.
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Post by OldGreenGrolar on Dec 15, 2022 6:03:25 GMT -5
1340 pounds for a polar bear is larger than average but it is only average for Foxe Basin males. At close weights the brown bear will be stronger pound to pound. The polar bear will be a slightly better grappler.
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Post by Deleted on Dec 15, 2022 6:05:24 GMT -5
The Grizzly would win in my opinion. It may be slightly smaller but it does have things to make up for its size disadvantage. The Grizzly is more aggressive, longer claws, has superior physical strength, better durability, better claw feats, and perhaps a stronger bite force, and the Polar Bear has size, better hunting skills, and better predation feats.
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Post by Deleted on Dec 15, 2022 6:39:39 GMT -5
1340 pounds for a polar bear is larger than average but it is only average for Foxe Basin males. At close weights the brown bear will be stronger pound to pound. The polar bear will be a slightly better grappler. I do recall Grizzlies killing Polar Bears larger than themselves in fights for Canadian territories.
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Post by theundertaker45 on Dec 15, 2022 6:44:18 GMT -5
@kaijufan1789
When has a grizzly ever killed a polar bear larger than itself?
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Post by OldGreenGrolar on Dec 15, 2022 6:58:50 GMT -5
@kaijufan1789 When has a grizzly ever killed a polar bear larger than itself? No account as far as I can remember.
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Post by Deleted on Dec 15, 2022 9:03:31 GMT -5
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Post by Deleted on Dec 15, 2022 9:04:14 GMT -5
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Post by brobear on Dec 15, 2022 9:10:17 GMT -5
I have watched on video barren ground grizzlies chasing polar bears; but no fights.
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Post by Deleted on Dec 15, 2022 9:21:07 GMT -5
I have watched on video barren ground grizzlies chasing polar bears; but no fights. Yeah i would call those MINI-fights. Although, Grizzlies have killed female Polar Bears larger than themselves.
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