Why do flies buzz?
Flies are among the fastest of all flying insects. The buzzing of a fly is the sound of its wings beating. A house fly’s wings beat about 200 times a second, and some midges move their wings 1,000 times a second. House flies fly at an average speed of 4 and 1/2 miles (7.2 kilometers) per hour. They can fly even faster for short distances to escape their enemies, which include people and many birds. [ Source: http://www2.worldbook.
