Researchers from Cornell University discovered that fish actually communicate with each other through sound. It is not new knowledge that fish actually emit different kinds of sound. However, with the development of technology, scientists have now confirmed that these aquatic creatures produce sounds for communication.
Aaron Rice and his team analyzed the sound-producing physical characteristics (eg. swim bladder musculature) across different species and concluded that ancient sturgeons first started chatting around 155 million years ago. That is right around the same time that mammals began speaking with each other, too!
Image credit: Hiroko Yoshii