7. Nano Hummingbird
In small stealth drone technology, the Nano Hummingbird marks an incredible feat. Just 16 centimetres broad and weighing only 19 grammes, this small wonder can hover and fly in any direction with amazing stability despite apparently almost impossible size. Its biomimetic design almost makes it invisible from natural habitat since it reflects the flying ability of real hummingbirds. While its tiny electric motors create almost little audible noise, the drone uses certain materials that absorb radar radiation. Its very small size lets it operate in limited areas and urban settings where bigger drones cannot reach, and its natural look offers great hiding place for monitoring activities.