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Post by Deleted on Mar 16, 2019 9:51:19 GMT -5
Most aggressive of the grizzlies, and probably all bears, are the barren ground grizzly of the Canadian tundra, The Gobi bear, and the Tibetan blue bear, all of which live in extreme isolation. I believe, from what little I have read on the subject of polar bears, that polar bears were once far more aggressive bears and were in fact notorious man-eaters. Your thoughts? Polar bears also live in extreme isolation just like the three sub species of brown bear you have mentioned. Yet the polar bear is less aggressive although they do calm down eventually. There are a few books out there that say the polar bear is the most dangerous of all bears but that's probably only to mankind because of their almost 100% Carnivorous diet. Not all brown bear subspecies are aggressive, for example, the kamkatcha bear is fairly docile despite being powerful.
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Post by King Kodiak on Mar 16, 2019 9:51:56 GMT -5
Good points. The reason I choose the three that I do; a sloth bear will attack ( human ) if we happen to invade his personal space. But, of the three grizzly subspecies mentioned, one of those guys might charge you from hundreds of feet distant. There have been reports of such. We can't say how one of them would react to a tiger. Yeah, good point also. Those are two different behaviors. Sloth bears might have more “defensive” aggressiveness, while bears like the Barren ground Grizzly and the Gobi bear might have more “offensive” aggressiveness.
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Post by brobear on Mar 16, 2019 10:02:29 GMT -5
Good points. The reason I choose the three that I do; a sloth bear will attack ( human ) if we happen to invade his personal space. But, of the three grizzly subspecies mentioned, one of those guys might charge you from hundreds of feet distant. There have been reports of such. We can't say how one of them would react to a tiger. Yeah, good point also. Those are two different behaviors. Sloth bears might have more “defensive” aggressiveness, while bears like the Barren ground Grizzly and the Gobi bear might have more “offensive” aggressiveness.Smart observation.
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Post by Deleted on Mar 17, 2019 1:53:58 GMT -5
Sounds right, the sloth bear does not normally initiate attacks unless they feel threaten whereas the barren ground grizzly would go out of its way to attack anything I its way.
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Post by OldGreenGrolar on Jun 19, 2019 23:12:43 GMT -5
I am not sure which is more aggressive between the barren ground grizzly and Tibetan blue bear. Both of them intimidate the apex predators in their respective domain.
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Post by King Kodiak on Jun 20, 2019 7:51:59 GMT -5
I am not sure which is more aggressive between the barren ground grizzly and Tibetan blue bear. Both of them intimidate the apex predators in their respective domain. Well, measuring who is more aggressive is very hard. I think both compete for the second place after the “fearless one” (sloth bear). But i am more inclined to choose the barren ground grizzly as the second.
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Post by OldGreenGrolar on Sept 5, 2019 9:55:56 GMT -5
In my opinion (from the most aggressive to the most passive): Barren ground grizzly, Tibetan blue bear, sloth bear, Mexican carlifornian grizzly, interior grizzly bear, Atlas bear, syrian brown bear, gobi bear, Kodiak bear and coastal brown bears and penisula Alaskan brown bears, polar bears, Ussuri brown bears, Eurasian brown bears, Kamkatcha brown bears, Asiatic black bears, American black bears,sun bear,red bear, spectacle bear, giant panda.
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Post by brobear on Nov 14, 2019 13:02:29 GMT -5
Both the barren ground grizzly and the Tibetan blue bear appear to be highly aggressive brown bears. They will both charge towards intruders of their home range. Bear Almanac - Second Edition: Brown bear uses speed to run down prey; charges in great leaping bounds ( while uttering a deep roar ); rears up in fight to grasp head or neck with teeth; swings powerful forepaws, with enormous body strength behind them. www.nwf.org/wildlife/wild-places/~/link.aspx?_id=934DCC77CFA24BFF9DA7B5F902B9912E&_z=zwww.gi.alaska.edu/AlaskaScienceForum/article/hybrid-grizzly-polar-bear-curiosityQuotes from sites listed above: Aklak vs. Nanook: A Tale of Two Bears Like most scientists, the Inuit view Aklak, the grizzly bear, and Nanook, the polar bear, as two very different creatures. Their traditional tales of polar bears almost always portray these animals as powerful, keen-witted and worthy of great esteem. The grizzly, on the other hand, is seen as a more sinister beast, one that is likely to charge unexpectedly in an explosive manner. Some biologists might agree with that assessment, citing evidence that barren ground grizzlies appear to be more aggressive than grizzlies living farther south. One explanation, they say, could be that northern grizzlies evolved in a treeless world where there's no place to hide, so threatening one's opponent may make far more sense than fleeing. Whatever the reason, bear biologist Andrew Derocher says he is "a lot more comfortable capturing a big polar bear on the sea ice than a small grizzly on land. Grizzlies tend to react much more aggressively. It can be very unnerving." UAF scientists doing genetic testing about a decade ago found that grizzly bears may be the ancestral fathers of polar bears, which over many thousands of years perhaps evolved to life on sea ice by developing all-white coats, furry feet, and teeth designed to rip seal flesh. People sometimes see the two bears together at whale carcasses, such as at a bowhead whale boneyard outside Kaktovik, where in fall both polar and grizzly bears feast on the remains of whales harvested by villagers. Those who have seen the bears there say that the grizzlies, often smaller than the polar bears, dominate the encounter. “They are two very different animals as far as behavior goes,” said Geoff York, a polar bear researcher at the USGS Science Center in Anchorage. “When a brown bear comes in at the bone pile, it chases off all the polar bears.”
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Post by brobear on Nov 14, 2019 13:03:08 GMT -5
blog.nature.org/science/2013/04/01/expedition-to-northern-tibet-part-1-the-land-of-charging-blue-bears/
Standing less than 80 feet from us was one of the rarest bears on the planet, the Tibetan blue bear (Ursus arctos pruinosus). We didn’t speak, there wasn’t anything to say. We both knew that our air horns were exhausted and that in retrospect we should have had a plan to let off one then the other. The bear stared at us with lips curled back. We stood frozen holding our bikes. It wasn’t more than a few seconds – time enough to process the gravity of the situation – before the bear turned and retreated. Twenty feet at first, then all the way to the bank, then half way up the sand dune, at each point turning to observe and perhaps reevaluate its decision to retreat, then finally over the top of the dune and out of sight. This was the first bear we had seen on the expedition.
With trembling hands we tore into Hamish’s bike trailer to retrieve the bike pump attachment required to recharge our air horns. Tibetan blue bears, a subspecies of brown bear, are spectacular. With a luxurious blue-grey coat, big white collar, black legs and black teddy-bear ears, they can look almost like a cross between a grizzly and a panda. Seeing them up close (too close you might say), it surprised me that so few people know about them.
The reason why very few people know of or see this bear is because it lives in one of the world’s most inhospitable places. It is mid-autumn and the temperature is -22 Fahrenheit, and that’s not considering the ferocious wind scouring the almost vegetation-free plain around us. The altitude hasn’t dropped below 16,400 feet (5000m) for over a week of travel and progress is only possible when we’re not sheltering from storms that carry a biting mix of snow and sand. It is a place captivating in its hostility. A land where giant sand dunes rest against towering glaciated peaks. A land of impassable mud in summer and punishing cold in winter. Of wild animals living on the roof of the world. We are on the northern margin of the Tibetan Plateau where the provinces of Qinghai and Xinjiang join the Tibetan Autonomous Region (TAR); a place too inhospitable for even the hardy Tibetan nomads to use. This is not the Tibet of documentaries. It is a landscape very few people know about, hidden in the centre of a continent. The northern part of the Tibetan Plateau is home to three giant nature preserves. The Qiangtang in the TAR, Aerjinshan in Xingjiang, and Kekexili in Qinghai. Other than the Greenland icesheet, this cluster of parks forms the biggest contiguous terrestrial protected area on the planet. A roadless wilderness bigger than Montana. Heavy travel restrictions, impassable mountain ranges, altitude, and ferocious conditions have made it one of the least visited places on the planet. - See more at: blog.nature.org/science/2013/04/01/expedition-to-northern-tibet-part-1-the-land-of-charging-blue-bears/#sthash.0Lk0hRuL.dpuf
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Post by brobear on Nov 14, 2019 13:03:38 GMT -5
The Grizzly Almanac:
It has been theorized that much of the grizzly's surly attitude may have arisen as a result of its evolution in the treeless tundra of the far north. Black bears, the theory goes, evolved further south, where they always had trees to which to escape. Grizzlies weren't so lucky, and therefore had to evolve a more aggressive behavior in order to survive.
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Post by Deleted on Mar 8, 2020 18:32:41 GMT -5
I think the barren ground boi is the most aggressive of all the living bears
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Post by brobear on Mar 9, 2020 4:12:40 GMT -5
I think the barren ground boi is the most aggressive of all the living bears My opinion as well. For the longest time, I was confused about where the barren ground grizzly lived. I thought that the barren ground grizzly was Canadian and the Yukon grizzly was Alaskan. Wrong - just the opposite. As for most aggressive living bear - in the contest is the sloth bear, Tibetan blue bear, Gobi bear, and the barren ground grizzly. All are known for their aggression. My vote goes to the barren ground grizzly... of the Alaskan tundra.
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Post by King Kodiak on Mar 9, 2020 5:05:57 GMT -5
Here i will defend "the leyend", and that is the sloth bear. We have seen Barren ground grizzlies charging at huge polar bears, so that makes them very aggressive. But how about if the polar bears would actually fight? Would those barren ground grizzlies fight or retreat? What we know from accounts, and have actually seen on video, are sloth bears actually fighing with tigers and making them retreat. There is even an account of a huge sloth bear that "supposedly" killed an adult male bengal tiger.
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Post by brobear on Mar 9, 2020 5:16:12 GMT -5
Tigers do not and could not live where the barren ground grizzly lives. But I'm sure that not only would the grizzly stand his ground to a tiger, he would charge towards the tiger on site of it. This is also the behavior of the Tibetan blue and the Gobi bears. Also, I'm not so sure that the sloth bear would be so brave when he sees a 1200 pound polar bear. None of these ideas/opinions can be proven. Therefore, you have yours and I have mine. ( we are both voting on a bear ).
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Post by King Kodiak on Mar 9, 2020 17:07:04 GMT -5
I agree definitely. If a barren ground grizzly charges a 1000 lb polar bear, than it would no doubt charge any tiger.
The Tibetan blue bear we already know yes. But i keep seeing you guys mention the Gobi bear as very aggressive, is there any account on his behavior? because i have never seen any.
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Post by tom on Mar 9, 2020 17:16:42 GMT -5
If we're speaking in generalities, IMO the Baron Ground Grizzly is the most aggressive of the Brown Bear sub species. I think it's been noted that due to the availability of food where they live, it's a must to be aggressive to eat and sometimes that means having to travel quite some distances to find a meal. Aggression IMO can be an individual trait too within each species. Some Individuals displaying more aggression than others.
High on the list I would include the Sloth Bear. What he lacks in power he makes up in total aggression which as we've seen against Tigers can prove effective.
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Post by Deleted on Mar 9, 2020 17:40:30 GMT -5
If we're speaking in generalities, IMO the Baron Ground Grizzly is the most aggressive of the Brown Bear sub species. I think it's been noted that due to the availability of food where they live, it's a must to be aggressive to eat and sometimes that means having to travel quite some distances to find a meal. Aggression IMO can be an individual trait too within each species. Some Individuals displaying more aggression than others. High on the list I would include the Sloth Bear. What he lacks in power he makes up in total aggression which as we've seen against Tigers can prove effective. A person who agrees with me I too think the barran ground boi is the most aggressive
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Post by brobear on Mar 10, 2020 0:02:02 GMT -5
The sloth bear is an excellent tree-climber. So why does he stand his ground against a predator double his own size rather than escape up a tree as would a black bear or a sun bear when there are trees all around and time to do so? Quote: The fossilized skulls of a bear once named Melursus theobaldi found in the Shivaliks from the early Pleistocene or early Pliocene are thought by certain authors to represent an intermediate stage between sloth bears and ancestral brown bears. I have never understood why the sloth bear is named ( Melursus ursinus ) with such close ties with the grizzly. Why not Ursus? But back to the built-in aggressive nature of the sloth bear. He has close ties with the grizzly. Like the polar bear ( even more closely related ) the sloth bear should be placed within the "Grizzly Photo Album" ... the brown bear family tree.
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Post by King Kodiak on Mar 10, 2020 7:50:33 GMT -5
One possibility is that bear biologists never bothered to change that Genus to Ursus. Anyhow, the Ursus part is still in that name Melursus.
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Post by brobear on Mar 17, 2020 8:38:40 GMT -5
I believe that the Asiatic black bear ranks equally along with the sun bear and sloth bear in sheer aggression. Climbing a tree to escape a large predator is not strong evidence of a lack of aggression. Two things involved are high intelligence and natural instinct. The sloth bear shares common early Pleistocene ancestors with the grizzly. Their survival instincts are simply different. Some experts consider the sun bear as possibly pound-for-pound the bear with the best evolutionary design for fighting. Let's face it; bears are bad-ass omnivores. These bear species are surpassed in aggression by some ( not all ) grizzly subspecies. I'm not sure where the polar bear fits in...
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