It is common for a grizzly (brown bear) to bite down on the jaw:
http://en.wikipedia.org/wiki/Bear_attack"...In contrast to injuries caused by American black bears, which are usually minor, brown bear attacks tend to result in serious injury and in some cases death. In the majority of attacks resulting in injury, brown bears precede the attack with a growl or huffing sound,[10] and seem to confront humans as they would when fighting other bears: they rise up on their hind legs, and attempt to "disarm" their victims by biting and holding on to the lower jaw to avoid being bitten in turn.[25] Such a bite can be as severe as that of a tiger, with some human victims having had their heads completely crushed by a bear bite.
Hunters are the people most at risk of bear attacks because, as Tom Smith, a U.S. Geographical Survey research biologist, describes, "Hunters typically aren't making any noise, and they sleuth around while wearing camo."[
Life's good for Alaskan who lost face in grizzly bear attackCraig Medred | Sep 13, 2012
NOME -- Almost a year and a half after the bear attack, after 26 surgeries and more than a $1 million in medical expenses, Wes Perkins is whole in body and still badly disfigured. There is no gentle way to describe his condition. Doctors had to use part of his fibula to create a jaw to replace what the bear ripped off of his face. He still has a tube in his throat. His left eye, which sees only light and dark, weeps constantly. And probably worst of all, for a man who always loved to talk, he is now hard to understand because he speaks with only half a tongue.
http://www.alaskadispatch.com/article/lifes-good-alaskan-who-lost-face-grizzly-bear-attack?page=fullB.C. man kills grizzly that attacked himHunter set upon by bear that knocked him down and crushed his jaw
CBC News
Posted: Sep 24, 2012 4:41 PM PT
A hunter is recovering at home in northern B.C. after he shot and killed a grizzly bear that was attacking him.
Conrad Boyes, of Vanderhoof, B.C., said he was hunting in a remote area near Fort Nelson earlier this month when he was confronted by the grizzly.
He said the bear stood up on its hind legs and let out a roar. The next thing he knew, he was on the ground wrestling with the huge animal.
"She crunched down on my jaw on my left side ... busted my jaw all to pieces," Boyes told CBC News Monday.
“I ripped my gun down from my shoulder, took the safety off and pulled the trigger twice, and she was just on top of me,” he said. “I got my gun in front of me, and then bang-bang, and that was it."
http://www.cbc.ca/news/canada/british-columbia/story/2012/09/24/bc-grizzly-attack-fort-nelson.html
