At the top of the dolphin’s head is the blowhole, which is equivalent to your nostrils. Just below the blowhole, in the animal’s nasal passages, are two pairs of organs called phonic lips. The dolphin clicks by forcing air through those lips and making them vibrate. The sound then travels forward and is focused by a fatty organ called the melon, which is what gives the dolphin its bulging brow. So a dolphin’s click begins in its nose and goes out through its forehead.