A swarm of autonomous tiny flying robots

Greenhouses, search-and-rescue teams and warehouses are all looking for new methods to enable surveillance in a manner that is quick and safe for the objects and people surrounding them. Many of them already found their way into robotics, but wheeled ground-bound systems have limited maneuverability. Ideally it would be great if flying robots, a.k.a. A group or a swarm of them should be ideal to cover as much ground as possible. The price of fully autonomous MAVs usually comes with the cost of weight and size.