It is thought that they prefer to rely on their more acute scences of smell and hearing. They are wilderness loners and do not want anything to do with man or other bears except for mating. Bears have their own personalities, and what one bear will do, may be entirely different from what another might do. What a bear will do today, he may not do tomorrow. For these reasons, you can never predict what a bear will do.
Bears also possess a great deal of pride.
A bear that that has lost a fight with another bear may indeed take it out on an unsuspecting person who happens along. Bears are also thought to hold a grudge against people. A bear that has been wounded by one hunter may take it out on several hunters or people. The grizzly likes domestic animals when he can get them. He especially likes carrion and will feed on the carcasses of animals and their gut piles.