Watching the wildlife is a highlight of any visit to a US National Park, but sometimes you spot something you weren't expecting. On a recent visit to Yellowstone, one hiker filming a herd of moose in Round Prairie was surprised to spot two of the huge animals chasing after a park visitor who had chosen to get a little too close, and was sprinting to escape.
Moose attacks are rare, but the animals can charge if they or their young are threatened, and are particularly likely to lash out if dogs are nearby since they cannot differentiate between a domestic dog and a wolf.
