The loudest animal in the world is the blue whale. Known for its immense size, the blue whale can produce calls that reach up to 188 decibels, which is louder than a jet engine. The sounds made by blue whales are used for communication, navigation, and possibly even mating. Their vocalizations can travel long distances underwater, allowing them to communicate with other whales over vast expanses of ocean. This remarkable ability is a significant part of their behavior and social interactions in the marine environment.