Both black bears and grizzlies can be brown, but no grizzlies live east of the Rocky Mountains Unprovoked, predatory attacks by black bears are rare but highly publicized. Such attacks have accounted for all 23 deaths by noncaptive black bears across North America this century. Most occurred in remote areas where the bears had little or no previous contact with people, rather than in and around established campsites. The worst attack occurred in Ontario in 1978 when a black bear killed and partially consumed three teenagers who were fishing. Predatory attacks by black bears are usually done without bluster or warning.
People involved in such attacks can improve their chances by fighting rather than playing dead.
Deaths from such attacks average a little more than one every four years across the United States and Canada. A sign of curosity, not anger, standing helps bears see and smell. By comparison, a person is about 180 times more likely to be killed by a bee than by a black bear and 160,000 times more likely to die in a traffic accident. Each year there are many thousands of encounters between black bears and people, often unknown to the people because the bears slip away so quietly. Menstrual odors have been shown to be attractive to bears, but there is no record of a black bear attacking a menstruating woman.