Stop and think of the loudest person that you know. They are not even close to the loudest animal in the world.
While many animals count on being very quiet to surprise their prey, these animals use their loudness in extraordinary ways, such as finding another individual, defending territory, romancing a mate, or warning their companions of predators.
The average human conversation is about 50 decibels, and the human eardrum will rupture at about 200 decibels. Yet, many of these animals approach that level regularly.
This video of the loudest animals on earth has been compiled by the decibel levels they can produce.