6. Blackfish (2013)
This film is saddening, shocking and has had a huge influence in sparking world-wide protests to free orca whales from captivity. It shares the story of Tilikum, a killer whale that has been help captive by SeaWorld, and that has taken the lives of several people including trainer Dawn Brancheau. The film highlights the problems of keeping orcas in captivity, the cruel treatment of these animals and the issues of the multi-million dollar business of sea-parks.