A bison in Yellowstone National Park appeared to stumble into the scalding water of Grand Prismatic Spring, causing its death as tourists looked on during the park's busiest season. The bison fell into the hot spring at Midway Geyser Basin near Old Faithful early Saturday, a spokesperson for Yellowstone said.

Over the weekend, a bison stumbled into the Grand Prismatic while several visitors could do nothing to save it.

Some Yellowstone visitors were left reeling from witnessing a bison’s last moments after the animal fell into one of the park’s hot springs. The incident happened Saturday, June 21, just before 7 a.m., according to Yellowstone National Park visitors who witnessed the bison’s demise.