Unmanned drones are being used in Peru to monitor crops and study ancient ruins.
The planes are operated with a remote-control system that requires a human pilot. Each drone has an aerial camera to take photographs of the crops.
The purpose of the drones is to determine what condition the plants are in and also whether the crops have any sort of problem such as a pest.
Also, researchers have been using the drones to get a closer look at archeological sites and now, are able to get images within minutes.
The planes are made out of various materials including woodcraft or carbon fiber. It is vital, however, that the drones are light and easy to run.