An elephant in Kenya's Tsavo East National Park, home to some 13,000 of these remarkable animals. Ivan Lieman/AFP/Getty Images hide caption

itoggle caption Ivan Lieman/AFP/Getty Images

An elephant at the Emmen, Netherlands, zoo stands at the edge of a ditch in 2009, a day after another elephant fell into the ditch and died. Olaf Kraak/AFP/Getty Images hide caption

itoggle caption Olaf Kraak/AFP/Getty Images

The arrival of African elephants at a Tucson zoo prompted a call for the zoo's fans to contribute leafy snacks. This file photo shows African elephants at the Pittsburgh Zoo & PPG Aquarium in 2011. Gene J. Puskar/AP hide caption

itoggle caption Gene J. Puskar/AP

A family of elephants in Kenya's Maasai Mara game reserve. Tony Karumba/AFP/Getty Images hide caption

itoggle caption Tony Karumba/AFP/Getty Images