A video from the San Diego Zoo Safari Park taken during an earthquake put complex elephant herd dynamics on display.

CNN obtained access to footage of a unique moment at the San Diego Zoo, when a herd of elephants surrounded one another for safety as a relatively minor earthquake shook the area.

This image taken from video released by the San Diego Zoo Wildlife Alliance shows a herd of elephants forming a circle to shield the two calves, Zuli and Mkhaya, during an earthquake, Monday, April 14 ...