We're pointing to a few things that you should know.
SWIMMING WITH WHALES
Posted April 16, 2016. From The New York Times: "A Conversation with Whales. By James Nestor. I held my breath and swam deeper, 10, 20, 30 feet. I heard a thunderous crack, then another, so loud they vibrated my chest. Below my kicking feet, two sperm whales emerged from the shadows, each as long as a school bus. The cracking was coming from the whales; it’s a form of sonar called echolocation that species of dolphins, whales and other cetaceans use to “see” underwater ... "
THE SINGING FISH OF BATTICALOA
Posted December 14, 2015. From the BBC: Since the 18th Century, fishermen of the Batticaloa lagoon in eastern Sri Lanka have navigated by the sound of singing fish. They use their oars to amplify the sound of the underwater music.