16. March 2020 animal welfare, media-echo Rudolph the Rough-Toothed Dolphin Can’t Hear Anything Published on meeresakrobaten.de the 15.03.2020. | By: Susanne Gugeler The Clearwater Marine Aquarium (CMA) saved a rough-toothed dolphin from a certain death: we have since found out that he is deaf. He wouldn’t have made it without zoos. » more