RoboFly
The first crop surveying robotic insect takes off
Screenshots

Hunter's comment
Engineers of the University of Washington designed this smallest robotic insect and they succeeded in their project.
They directed an invisible laser beam at a photovoltaic cell which is attached above the robot and converts the laser light into electricity which serves as a power source for the robot operations.
Future RoboFlies can also look forward to more advanced brains and sensor systems that help the robots navigate and complete tasks on their own, Fuller said.
These drones are helpful on surveying crops growth on large farms. They are very small in size and are cheap to make
Link
https://www.washington.edu/news/2018/05/15/robofly/
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