Tourists on the trip of a lifetime to Yellowstone National Park were left horrified after a bison stumbled into one of the park’s scorching hot springs. The animal—one of between 3,500 and 6,000 that inhabit the volcanic area of natural beauty—was seen thrashing around at the edge of the Grand Prismatic Spring before succumbing to the heat.

Tourists watched in horror as a hot spring in Yellowstone National Park boiled a bison alive on Saturday, The Cowboy State Daily reported. Around 7:30 a.m. local time, onlookers saw the bison walking near Grand Prismatic Spring,