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.

A bison stumbled into the Grand Prismatic this past weekend while several visitors could do nothing to save it.

Grand Prismatic Spring in Yellowstone National Park became the site of a truly "heartbreaking" event. Tourists watched, stunned, as a bison tragically stumbled and fell into the scalding 160-degree water.