An Apology to Elephants (2013)
An Apology to Elephants is a 2013 documentary that explores purported abuse and brutal treatment of elephants. It showcases elephant training and the alleged psychological trauma and physical damage done by living conditions in some zoos and circuses. It was premiered on HBO on April 24, 2013, also celebrated as an 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, also known as an "elephant lady", who died on February 15, 2013.
More at Wikipedia.