In 79 AD Mount Vesuvius blew up, marking a Monumental Disaster for all the witnesses. Almost nobody survived the lava, and more importantly, the ash and gases. Towns were obliterated, wiped from sight. Pretty horrific.
When Nature pushes the button, no critter or crowd can do anything but get out of town. With all due haste. If possible.
There were no Rhinos in residence at the time, so that’s one relief, among a meagre handful.