Black bears have the potential to be dangerous, but they usually aren't. The few exceptions are those who have not learned to fear people. This may be the case with park bears who have lived for generations in national or state parks where park visitors may feed the bears, either intentionally or through careless camping and picnicking habits, and where hunting bears has for generations of bears been forbidden by law. Other exceptions may include bears who live far in the wilderness where they have had little contact with man, and may view a human being as no more than another animals who appears defenseless or weaker than itself. Nearly every case where a human being has been harmed or killed by a black bear has been in a national park or protected forest. According to a book by Mike Cramond, entitled "Killer Bears", between the years of 1948 and 1980, sixteen people were killed by black bears. In one case, a single bear killed three children. In another, two people were killed by the same bear, so thirteen bears were involved in these sixteen incidents. All but three of them were in parks or in remote areas of Canada and Alaska. Of the sixty-nine people who were attacked or injured by black bears, according to the book, forty-two were in parks at the time of the attack. Of the other twenty-seven, all but six were in Canada or Alaska.