Fruit flies use treadmills at the gym

Researchers in the USA have built tiny treadmills for fruit flies. They have set up cameras to find out how these fruit flies walk on the treadmills. The nervous system of the flies helps the insects walk at different speeds. The study will help researchers find out how animals move. The treadmills have two belts, which help the fruit flies walk quickly on one side and slowly on the other.