A team of marine biologists at the University of Southern Denmark has discovered a solo male dolphin living in the Baltic Sea, who appears to be talking to himself. In their paper published in the journal Bioacoustics, the group describes how they analyzed underwater sound recordings that captured thousands of sounds made by the dolphin and what they learned from them. A team of marine biologists at the University of Southern Denmark has discovered a solo male dolphin living in the Baltic Sea, who appears to be talking to himself. In their paper published in the journal Bioacoustics, the group describes how they analyzed underwater sound recordings that captured thousands of sounds made by the dolphin and what they learned from them. Plants & Animals Phys.org – latest science and technology news stories