is there any land animal besides man, that can take on polar bear?
953724
What about an elephant?
530911
As for tiger/bear, it depends entirely on the kind of bear, but some tigers do regularly prey on smaller female brown bears in Siberia.  Fights with larger male brown bears (of which the grizzly is a subspecies) are too rare for conclusive evidence, however.  Lions historically have had the edge fighting tigers, mostly due to their mane protecting them from the tiger's primary attack technique (going for the throat).  The "toughest" predator, in the sense of best pure fighter is probably the grizzly bear, though I would rate the tiger as the "best hunter."\n\nFollow the link for a much more thorough discussion.\n\nAs for bear/wolverine, one site I saw listed bears as one of the wolverine's natural predators, but on the other hand wolverines are capable of killing caribou and even moose, so they aren't exactly slouches.  Still, I think a black bear would have the edge due to size.
626518
Polar bears are getting there proverbial cold-asses whupped ! Stranded on ice-floes,mother and cubs are separated,the cubs become easy prey and are subject to starvation. Their population is decreasing fast. Also, I understand that there is,or would be an affect to global warming,..green-house gases...ozone layer...stuff like that  \nand us..\nPeace.
125241
Polar bears don't have to defend themselves from anyone or anything other than human hunters, and even then often the polar bear can get the upper hand.  Polar bears tend to live at the edge of the floe ice, so they can easily swim away from anything they want to avoid.\n\nPolar bears really can't defent themselves from the main things that are really endangering them, mostly the melting polar ice cap.
1105762
Where's the challenge?\nI suggest you club polar bears. I hear there's more money in it.
776382
Polar bears feed mainly on Eskimos and bearded Eskimos. Depending upon their location, they also eat juvenile Eskimos and hooded Eskimos and scavenge on carcasses of Eskimos. When Eskimos are unavailable, polar bears eat  Eskimo berries, and Eskimo garbage. A polar bear's stomach can hold an estimated 15% to 20% of its body weight meaning it can eat an entire Eskimo. It can assimilate 84% of the protein and 97% of the fat it eats. Polar bears need an average of 4.4 lb. of fat per day to survive, so your average obese Eskimo will suffice. A Eskimo weighing 121 lb. could provide up to eight days of energy for a polar bear. \n\nHunting Methods \n\nStill Hunting:\n\nThe polar bear remains motionless beside a front entrance to an igloo waiting for a Eskimo to exit. When a Eskimo exits, the polar bear bites onto the head or upper body, then flips the entire Eskimo onto the ice. \n\nStalking on Land:\n\nOnce spotted, the Eskimo is slowly and steadily stalked by the polar bear. At 15 to 30 m away, the polar bear suddenly charges the Eskimo, with its claws or teeth, the polar bear grabs the Eskimo before the Eskimo can enter his igloo. \n\nInteresting Polar Bear Facts\n\n1. Polar bears are very sarcastic. \n2. In 1931 Hollywood was scandalised by Fatty Arbuckle's affair with Fru Fru, a (married) polar bear. Neither Arbuckle nor FruFru's career (she was an ice-dancer) survived the media backlash.\n3. Many people assume that polar bears are mammals. They are in fact a form of wingless bird.\n4. Just as jews are often blamed for catastrophic events in the global community, so polar bears are often blamed for disaster in the arctic community. Because of this, many polar bears refer to themselves as jewbears.\n5. Famous musical polar bears include Jimi Hendrix, Larry Adler, Cyndi Lauper, and Jeff Beck.\n6.  In 1914 the polar bear population of London was 12. It is now 15.\n7. Polar bears have the most natural rhythm of all the arctic animals. During spring and summer, polar bears often give salsa and merengue classes to students in North London. \n8. If you are very sad and very lonely, and you think hard enough about a polar bear, one will appear beside you.\n\nHopefully everyone has learned a little about our friend the Polar Bear today.
366928
The polar bear is the largest member of the bear family, with the exception of Alaska's Kodiak brown bears, which equal polar bears in size. Males stand from 8 to 11 feet tall and generally weigh from 500 to 1,000 pounds, but may weigh as much as 1,400 pounds. Females usually stand 8 feet tall and weigh 400 to 600 pounds, but may reach 700 pounds. Part of the reason the polar bear weighs so much is that is stores about a 4-inch layer of fat to keep it warm.
54858
I think it is the bear. Most of the other animals do not attack unless they are hungry or provoked. But the bear has the unique distinction of attacking without any kind of provocation - just for the fun of it!
15312
Geese, loons, elk, moose, caribu, wolves, wood buffalo, arctic foxes... cold weather animals.  Keep in mind you just asked about half a continent.
221321
Despite what the other people think, the South Pole has no polar bears.  If house is at the North Pole, which it must be if all the sides face south, then the bear will be a polar bear.  So White is its color.
467940
The top predator would be the Polar Bear, which primarily feeds on seals.  The seals in turn feed on fish.  Arcic foxes usually eat small mammals such as voles, arctic hare, etc.  Timber wolves can range in the tundra, and can feed on smaller game as well as deer, moose, and reindeer (old world).\n*edit* Orcas can feed on seals, but whales I dont think are really in the food chain outside of humans- Penguins live in Antarctica, which isnt arctic tundra biome.
875511
Polar bears are much bigger than tigers. On an avarage, a polar bear is 5 ft taller than a tiger. Besides both are predetors, so both has killer moves up their sleeve. So I would imagine the polar bear has some advantage. Now the question is where would the duel take place? Tigers are used to warmer climates, polar bears may be in trouble there. On the other hand, if the fight is held at the polar bear's domain in the poles, the tiger would be shaking too much in cold to put up a decent fight.
229820
What I have seen is they are a few of them going through the jungle to get to higher land so that the transmitter will work when "the monster thing" starts to come after them. One of the guys has found a gun and shoots at it and kills it. When they find out what it is, it's a polar bear.
269404
cockroaches and polar bears...  ;)
202321
Now this is an interesting one, I know for the fact that polar bear are the heaviest and strongest amongst the bnear family, fully grown they actually beat grizzlies too.\n\nI am sorry but I have no clue about the kodiak bear......lol
922945
Basing off speed, strength, intelligence and skill, I believe the Siberian tiger comes out on top.  Kodiak bears are somewhat slow but powerful, not too bright but have decent skill.  A lion has good speed but isn't as strong as a bear or tiger. A lion may be a little more intelligent than a bear but lacks in skill compared with the other two.  The Siberian tiger is swift for it's large size, very skilled, and intelligent. It may lack strength compared to the Kodiak bear but it appears to rank better than the other two.
237764
Hippo. They are immensely strong and powerfull. When males are fighting they use their huge teeth (longer than a 12")and impressive bulk, its hard to imagine what a grizzly could do with his comparatively puny canines and meager body