We've seen plenty of tiny UAVs (or NAVs -- Nano Aerial Vehicles -- as they're also known), but none quite like the robo-hummingbird that's been in development at DARPA-contractor AeroVironment for the past couple of years. While we haven't heard much about it during that time, the company recently completed its most advanced prototype to date, dubbed Mercury, and it's taken advantage of the opportunity to show off all the progress it has made. As you can see in the video after the break, the bot is able to fly about
