Bottlenose dolphins Rocky and Rambo are seen as Femke Den Haas cleans a net, after they were relocated at the Bali Dolphin Sanctuary rehabilitation centre in Buleleng, Bali, December 10, 2019. Just a year ago, Rambo was confined to a shallow, chlorinated pool in an Indonesian hotel on the island of Bali entertaining visitors from around the world by jumping through hoops. Courtesy of Tim Calver/Ric O'Barry's DolphinProject.net/Handout via REUTERS

People prepare a bottlenose dolphin Dewa to move to Bali Dolphin Sanctuary rehabilitation centre, a project initiated by Bali provincial government and operated by Ric O'Barry's dolphin project team, in Buleleng, Bali, October 8, 2019. More than 3,000 dolphins are in captivity around the world as part of an entertainment industry that generates up to $5.5 billion annually, a 2019 report by World Animal Protection says. Courtesy of Johannes P. Christo/Ric O'Barry's DolphinProject.net/Handout via REUTERS

People prepare a bottlenose dolphin to move to Bali Dolphin Sanctuary rehabilitation centre, a project initiated by Bali provincial government and operated by Ric O'Barry's dolphin project team, in Buleleng, Bali, October 8, 2019. Courtesy of Ric O'Barry's DolphinProject.net/Handout via REUTERS

Bottlenose dolphins Johnny and Dewa are seen at the Bali Dolphin Sanctuary rehabilitation centre, a project initiated by Bali provincial government and operated by Ric O'Barry's dolphin project team, in Buleleng, Bali, October 8, 2019. Courtesy of Ric O'Barry's DolphinProject.net/Handout via REUTERS