Shocking! Elephant crushed a man to death in Zambian park. Graphic picture.

According to reports this man was trampled by an elephant at Mosi - O- Tunya National Park, Zambia.

I wonder how this could have happened and what's the man doing in the park in the first place unprotected. I know that most animals don't attack humans. They do when we starts encroaching in their environment. It must have been an excruciating death.