"Bull elk are unpredictable and much more aggressive during this time of year and people have been severely injured," the NPS wrote in a statement. "Elk run quickly and may change direction without warning. Attacks can be unprovoked and unpredictable."
The NPS said travelers should always keep at least 75 feet between them and an elk - or the length of two full-sized buses - and to back away immediately if an elk approaches them.
Capturing photos of wildlife is one of the coolest activities in Yellowstone, but visitors should never approach or pursue an animal to take their picture. Instead, the NPS recommends travelers use a lens with a focal length of 300 mm or more.
If an elk does charge, the NPS said visitors should shelter in their vehicle or run "behind a tall, sturdy barrier as quickly as possible." And if shelter is not available, they should simply run.
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