A while back I posted a video of "Robojelly," a US-produced mechanical jellyfish. Well, German pneumatic and electric transducer manufacturer Festo has something much, much more impressive--the AirJelly:
And that flying robot jellyfish (they've got an aquatic one, naturally) isn't even the most impressive of Festo's robot creations; that would probably be SmartBird, a flight-capable robot bird. But they've got whole flocks of other amazing lighter-than-air robots, like these blimpy, self-navigating AirPenguins, their AirRay, which looks like a really creepy flat metallic balloon, and their SmartInversion, a flying...M. C. Escher-ish geometric thing that twists upon itself to generate propulsion--all constructed from ultralight materials, propelled with Festo's new line of pneumatic actuators, and mostly buoyed with helium.
Here's a video in which they describe how some of their "bionic" creations work: