That depends on many factors: age and health of the lion, species age and health of the bear, etc. In reality, size and weight really doesn't have much to do with whether a bear could kill a lion or not: it actually has more to do with experience and fighting-ability. A young bear would be foolish to mess with an adult lion, whereas a young lion would be foolish to mess with a larger bear like a grizzly, brown or polar bear, or even the more aggressive black bear.
Between an experienced lion and a male black bear, it could be a draw. Both are aggressive as the other, even though one may be a little larger than the other or the same size (most black bear boars are larger than an adult lion), because both have to defend their territories from rivals.
With a lion versus an Alaskan brown bear, a Grizzly or a Polar bear though, it's likely that such a bear could do enough damage to a lion to kill it. This scenario is most likely with a polar bear vs. a lion than a grizzly/brown bear vs. lion because polar bears are adapted to hunt and kill animals. But so are grizzlies and brown bears, since it's not uncommon for them to hunt down and kill moose, deer, or caribou if they're hungry enough.
So to answer the question, there really is no definitive answer because of the reasons stated above.
On land, the walrus and/or bull, no question. Those large tusks from the walrus and large horns from the bull (if the bull is indeed horned) are more than enough to intimidate and/or kill a polar bear. In the sea, no body because the walrus would swim away faster than the bear could catch it, the bull would drown, and the polar bear would be left holding the bag, so to speak.
Definitely. A polar bear is much bigger and stronger than a grizzly bear, when it has sharper claws, stronger jaws, and is a better killer.Large male polar bears are larger than male grizzlies. However, since the grizzly is a race of the brown bear, which has specimens as large as polar bears, it's hard to say. The race called grizzly bear is somewhat smaller than the coastal race called Kodiak bear. There exists video of a grizzly bear driving polar bears away from a garbage dump.
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Possibly.
Yes! A bear could beat the unicorn and knock the unicorn out.
No bear would dare mess with, let alone kill a bull moose on the rut.
No.
Yes. A bull moose could even kill a grizzly bear.
Yes, if the kodiak bear avoided the moose's hooves and antlers (if it is a bull moose). Even a grizzly bear or an alaskan brown bear could kill a bull moose, but not when it is on the rut.
because they were secret lovers
On land, the walrus and/or bull, no question. Those large tusks from the walrus and large horns from the bull (if the bull is indeed horned) are more than enough to intimidate and/or kill a polar bear. In the sea, no body because the walrus would swim away faster than the bear could catch it, the bull would drown, and the polar bear would be left holding the bag, so to speak.
Yes. A bull has those sets of sharp horns and strength muscles with hooves and a charging speed, which can possibly kill a bear. A bear would win against a bull because it could claw and swipe the bull with those bloody, big claws or bite its head with its massive jaws. If the bull gored the bear to death, then it could definitely win such a fight.
A grizzly bear, a crocodile, a rhinoceros, an elephant, a hippo, a large enough gorilla, a bull, a polar bear, a kodiak bear, a poacher armed with a gun or a knife, and a hippo.
There are too many variables to this question, since it depends on the species of bear and what that species of bear is compared to the breed of bull. In a general sense, their strengths could be equaled, though some may argue that a bull has more power than a bear any given day.
The Bull and the Bear - 1902 was released on: USA: May 1902
The bull has sharp horns, faster speed, strong hooves, and a powerful body that can knock down the black bear. One charge from the bull will beat the black bear if the black bear does not bite the bull's face.
The bull would win, unless the polar bear bites its face or claws the bull down.