An Apology to Elephants is a 2013 documentary that explores abuse and brutal treatment of elephants. It showcases elephant training and the psychological trauma and physical damage done by living conditions in some zoos and circuses. It premiered on HBO on April 22, 2013, also celebrated as Earth Day. The documentary includes interviews with environmental activists and biologists, including Performing Animal Welfare Society co-founders Ed Stewart and Pat Derby. The film was dedicated to Derby, who spent her life rescuing performing animals. Also known as an "elephant lady", she died on February 15, 2013.