I think the Polar bear could take on both at the same time though
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To your question earlier, I'll just post a few to show that although a bear of brown and or white has the size and power it dosent exclude lions and tigers from being able to kill them...
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Lion kills bruin the grizzly bear
As big as this bear is, an the fact that it mentions they looked at each other before the attack shows that size dosent play much of a intimidating role towards lions, well atleast similar sizes (not elephant type sizes 1 on 1) aiding the whole purpose they have manes, they are prone to intimidating, so toppled with the fact they can grow very large as well, the parality still leans towards a lion being more agressive and more the liable one to be the better fighter via willingness to being more experinced to fight x there already well establishments in having the most moralitys of killing there own kind. So a few hundred pounds may aid the bear in having a strength advantage but body builders wouldent hold a candle to a mma fighter,*besides lions "Rutinely" take out more powerfuller an animal who out weighs the bear 2-4x fold...Buffaloes
http://www.youtube.com/watch?v=Oo4cGB0U4iQ
So I dont think a few hundred pounds is going to make a signifcant advantage of anything.
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Heres alfred courts one, theres a few other pictures of the polar bears, but his were quite small, I'd say no bigger than 1,200 pounds, but than again, the 2,200 pound polar bears are just as rare as a 950 pound lion lol
lion kills polar bear 1955 By Alfred Court.[Book]Pages 131-132,
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Just got another one of a lion killing 2 leopards an fighting a bear, it dosent say who won with the bear, but I'll see if other archives has more details an maybe pictures of the incident,...
lion kills 2 leopards an fights bear
Lions killing leopards comes to no surprise, in the wild I dont think there ever will be a situation where a leopard attacks an kills a male, the out come even in 2 to one wouldent fair well because they un-like lions dont have unity...
http://www.youtube.com/watch?v=A-fRSa2Sqt4
That actually says alot about the lion too, for its a learning process in terms of who the predator attacks, its quite intresting that felines of all speices tend to show no fear of bears, like how there are many accounts of leopards, jaguars and pumas holding there own an ambushing bears of black an brown reguardless of size an status same with leopards ambushing giant mountain gorillas yet again no storys of a leopard or leopard(s) ambushing a male lion? I think its because the (wild) male lion never hasent any real signs of fear emited other than crossing water or humans, but rivalery of other speice conflict in terms of combat. Startled by noise, or the unexpected? Of course, even elephants get startled by mice, but fearing an animal in an open display of dominace male to male?...there is little to none in the male lion. of course there is a no brainer like a 10,000 pound hippo comeing at you..you run, but I'm sure the bravest of lions have held bay the hard hitters before beknwonst it might be a lost cause...its also called "Gameness"
You know, Pitbulls? Thats what gives the biggest edge over a tiger...just my opinion.
Edit=
Besides, a tigers model social trait encountering another foe, is like...
Tiger= Dont you f*** with me!!!
A lions encountering another foe is like...
Lion= Lets go, B****!!!
The tiger is more of a defensive stance, an the lion a offensive stance.
lol