An Italian scientist, Lazarro Spallanzani, was the first to investigate the phenomenon of how bats operated in the dark. 150 years later, Donald R. Griffin, a Harvard undergraduate, decided to look further into this mystery. Sometimes bat sonar is called bisonar since it is produced by a living organism, not a machine. It is similar to the sonar used by the military. The military spends hundreds of thousands of dollars each year to study the highly complex sonar of bats and certian marine mammals.
Many bats have facial folds, wrinkles or leaves of skin.
The relationship between facial ornamentation and echolocation is not always clear, but it would make sense that bats have evolved with these facial features for a particular reason. Wings are a very special adaptation of bats. No other mammal has the gift of flight and true wings. The teeth of bats are very specialized. Bats who eat flesh have very large canine teeth.