Recorded by the National Oceanic and Atmospheric ... sound recorders called hydrophones — that continuously record sounds of the ocean to monitor long-term changes and trends underwater.

But scientists at the University of Auckland in New Zealand recently recorded a rig shark ... similar to a human’s vocal cords, generating sounds. But sharks “were thought to be silent ...

In 2022, scientists at the Swedish University of Agricultural Sciences recorded two species of stingrays making clicking sounds, which researchers described as a possible warning or distress signal.