From Yahoo News:
Miniature robots could be good spies, but researchers now are experimenting with insect cyborgs or "cybugs" that could work even better.
...The military and spy world no doubt would love tiny, live camera-wielding versions of Predator drones that could fly undetected into places where no human could ever go to snoop on the enemy. Developing such robots has proven a challenge so far, with one major hurdle being inventing an energy source for the droids that is both low weight and high power. Still, evidence that such machines are possible is ample in nature in the form of insects, which convert biological energy into flight.
I know, I know—I sound like a conspiracy theorist. But you have to admit, the prospect is unsettling. The full article can be read here.