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We update or extend data presented by Herrero (1985). Injury rates were low, 1980-1985. The highest rates were 317,700 and 328,645 park visitors per injury inflicted by black or grizzly bear in Kluane and Denali National Parks. Injury rates calculated against number of backcountry user nights were significantly higher for all parks where injuries occurred, but this exaggerates the danger from bears in backcountry areas since day use is not included. In certain national parks such as Glacier (Montana) there appears to have been an increase in grizzly bear-inflicted injury to persons travelling off-trail. The potential danger from grizzly bears that are habituated to people and/or have learned to feed on people's food or garbage is stressed by focussing on 8 fatal, predatory attacks on people in Glacier (Montana), Yellowstone, and Banff National Parks between 1967-1986. Habituated grizzly bears may also attract photographers who may be injured or killed by such bears. Carrying dead ungulates or imitating the sounds of prey may attract grizzly bears and this may lead to human injury. Five cases of grizzly bear-inflicted injury (including 2 deaths) were identified in which this appeared to have been a common circumstance. Additional evidence is cited supporting the idea that grizzly bear injuries inflicted during sudden encounters are most likely to occur in habitat where grizzly bears have been attracted by natural foods during the time when the injury occurred. A through search for records dated between about 1965-1985 of polar bear-inflicted injury revealed only 20 injurious incidents. In 15 or 16 of these the bear's motivation appeared to have been predation. Six people were killed in such incidents. At least 251 polar bears were killed during aggressive encounters. Only 5 or 6 aggressive interactions (3 or 4 leading to human injury) were attributed to females apparently defending their young. Female polar bears appear to be less aggressive toward people in defense of young than are grizzly bears, but more aggressive than black bears.