A woman roars at a bear and two cubs in order to ward them off while hiking.
Runner Laura Gold encounters the animals after turning a blind corner on a trail in Sierra Madre, California, on Wednesday 8 November.
The video shows Gold slowly backing away and roaring to scare the bears, but the trio continues to follow her.
Another hiker coming behind Gold encouraged the bears away down a separate trail, leaving a path free for the hikers to follow.