Birds can navigate both urban and real jungles with ease even when they're facing moderately turbulent winds. If they could speak, we'd have already asked their secret. But since they can't, the Stanford School of Engineering built one of the most advanced wind tunnels in the world. It's where assistant professor David Lentink study them more closely in order to develop more stable drones. The tunnel has a turbulence generator that simulates different wind speeds and patterns, as well as high-speed cameras that record every flap of the birds' wings as they fly inside.