Here's a demonstration of how NOT to photograph bison at Yellowstone, courtesy of two tourists

Close-up of bison in field bellowing.

Each year, the National Park Service warns the public that bison are dangerous, but each year some people choose not to listen – like these two visitors who decided to wander off the boardwalk to snap selfies with a particularly large animal.

A video of the pair (recorded by another park visitor from a safe distance) was shared via Instagram account TouronsOfYellowstone this week. The account specializes in calling out bad behavior at US National Parks, which all too often involve people interfering with wildlife – including chasing bears and taunting elk.