Tiny spy planes could mimic birds, insects

They could be used to spy, but also to locate people inside earthquake-crumpled buildings and detect hazardous chemical leaks.

The smaller, the better.

Besides the hummingbird, engineers in the growing unmanned aircraft industry are working on drones that look like insects and the helicopter-like maple leaf seed.

Researchers are even exploring ways to implant surveillance and other equipment into an insect as it is undergoing metamorphosis. They want to be able to control the creature.

The devices could end up being used by police officers and firefighters.

Their potential use outside of battle zones, however, is raising questions about privacy and the dangers of the winged creatures buzzing around in the same skies as aircraft.

For now, most of these devices are just inspiring awe.

With a 6.5-inch wing span, the remote-controlled bird weighs less than a AA battery and can fly at speeds of up to 11 mph, propelled only by the flapping of its two wings. A tiny video camera sits in its belly.

The bird can climb and descend vertically, fly sideways, forward and backward. It can rotate clockwise and counterclockwise.