It’s no surprise that DARPA in the USA invests money in some very interesting, and sometimes weird, projects. One of the recent ones are are Nano Air Vehicle, or NAV in short.
Nano Air Vehicle is being developed by AeroVironment and is basically a hummingbird. Well, it looks like one, that is. It has wings instead of rotating chopper blades.
The prototype shown in the video below is part of the project that’s been ongoing for 2 years. It shows how they remote control their bird, though it only has enough power to be airborne for about 20 seconds.