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Though usually shy and cautious animals, Asian black bears are more aggressive toward humans than the brown bears of Eurasia. Brown bears seldom attack humans on sight, and usually avoid people. They are, however, unpredictable in temperament, and will attack if they are surprised or feel threatened. Perhaps the most infamous fatal bear attack is that of Timothy Treadwell, an environmentalist who in 2003 was mauled to death and almost fully consumed by a brown bear in Katmai National Park. In some areas of India and Burma, sloth bears are more feared than tigers, due to their unpredictable temperament.