Grizzly bear attacks on humans are rare, occurring on average about once or twice a year in North America.
The brown or grizzly bear often becomes a confirmed maneater, but black bears seem to attack more often, because there are many more black bears than browns.
Often times, bears will only strike on humans if it feels that itself (or it's children, if it has any) is/are threatened. Especially in the name of defending the cubs.
Grizzly bears are the biggest predators in their environment. Even wolves and mountain lions can't kill grizzly bears because the Bears are well armed with their size, strength, claws, and teeth. However, grizzly bears can be a threat to each other; in particular, males often try to kill cubs so that their mothers will be ready to breed sooner.
Overhunting and the loss of natural habitat due to land development by humans.
No. The two bears are just as dangerous. The bear is a vry unpredictable creature. It is also very powerful. Many people survive Grizzly Bear attacks. This is mainly because the bear assumes the threat is not that major and it goes away. Some times they get confused and wander away after they attack. As well they can be scared by loud noises or retaliation of many sorts. Grizzly's may even skirt away by simply shouting at them. However a Polar Bear rarely gets confused or scared away after they strike. Once a Polar Bear feels the threat is removed it will continue to maul and then eat you. Normally Polar Bears don't stop simply because you play dead. A grizzly will often stop the attack if it thinks you're dead or of no threat at all. Polar bears are generally in it for the kill. Grizzly's very, very rarely actually "hunt" humans. They eat meat, just a polar bears do but humans are generally not on their list as prime prey for eating. A Polar Bear will, and are known to hunt humans. They will track you for miles if necessary. Humans are on their general menu if need be. Humans are almost never on a Grizzly's menu (although they will eat you if extremely hungry). Naturally both bears are very deadly and can be ferocious. However the Polar Bear will go to YOU if it sees you in it's vicinity where as a Grizzly will normally go the other way. Throw either a Grizzly or Polar bear cub's into the scenario and your odds of making it out in one piece decrease dramatically with either bear. You would much rather have an encounter with a Grizzly Bear than a Polar Bear for the aforementioned reasons. Simply because you have a decent chance of coming out of a Grizzly attack at least "alive" where as the odds are stacked against you if you have an encounter with a Polar Bear. Ian Billen
YES
Yes. Brown bears, like Grizzly Bears especially, often kill and eat adult or young black bears whenever they meet each other.
Yes, they do attack humans, but swimming humans are often mistaken by a great white shark for a seal.
A grizzly often has a territory that extends around 100 miles wide. Male bears tend to have larger territories than females do since they have to look for mates during the breeding season, unlike the females.
It\'s possible, actually. Bison will attack a grizzly bear if that bear is going in to attack one of the calves of that herd, and those horns on a bison, short though they seem, can deliver a lot of damage to a grizzly, probably enough to kill it.
All the time.
Yes, because grizzly bears are heavier and larger than lions.