A group of hikers have been filmed harassing a mother black bear and her cubs in Grand Teton National Park, crowding around the animals to get a better look and take photos. It's always important to give wildlife sufficient space, but this is particularly dangerous; black bears rarely attack people, preferring to avoid close encounters, but can become aggressive if they feel they or their cubs are threatened.
The National Park Service (NPS) warns that bears can seem to be tolerating the presence of humans, then attack with little warning.
