Researchers have made history by recording sharks making short, high-frequency clicks for the first time. The study, published in Royal Society Open Science, reveals that these marine predators are capable of producing sound when handled underwater. Led by marine biologist Carolin Nieder, a team observed this unusual behavior while studying the hearing capabilities of several shark species in New Zealand waters. During her research project at the University of Auckland, Nieder noticed that rig sharks – a small coastal species native to New Zealand – began crackingling when she interacted with them between tests. This groundbreaking discovery marks the first known instance of a shark actively producing sound.
Source: https://www.scientificamerican.com/article/scientists-record-first-known-shark-sounds