Manta rays06/06/2016June 6, 2016Overfishing and demand for their gill rakers in Chinese medicine are threatening the majestic manta rays off the coast of Mozambique. But they have a champion in marine biologist Andrea Marshall.https://p.dw.com/p/1J12lImage: picture alliance/AP PhotoAdvertisementThe realm of the manta raysTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video