Part three of five…
No. 3 The $4 million hummingbird spy drone
Keep watching the skies but start looking for birds not planes. Weighing in at less than an AA battery, the American-made 16 centimetre hummingbird spy drone is one of the most adaptable pieces of spy technology in existence.
With a top speed of 11 miles per hour, this tiny drone can be controlled from a distance and powers itself along by flapping its wings.
Pentagon experts hope in the future it will be able to swoop and sit on fences and power lines.
The surprisingly natural appearance of the spy drone lends itself to being undetectable in both urban and rural spaces.
