Depth 1
How dolphins communicate underwater using vibrations
Dolphins don't just use clicks and whistles to talk; they practically punch each other with sound! Because water is dense, it carries vibrations nearly five times faster than air. A dolphin can send a burst of high-frequency clicks that hits another dolphin's body like a physical shove. They use a special fatty organ in their foreheads called a melon to focus these sound beams. Interestingly, scientists discovered that a dolphin can even use echolocation to beam sound right through another dolphin's skin, practically reading their internal organs like a living medical ultrasound machine.