The stealth birds might be covered with real feathers in order to avoid radar and sonic detection. ? TN Editor

If you've ever looked up to the sky and enjoyed the sight of a bird gliding above, be warned: it could be a Chinese drone monitoring your every move.

The idea might seem far fetched, but robotic birds are very much a reality, and China has been using them to surveil people across the country.

Sources told the South China Morning Post that more than 30 military and government agencies have deployed the birdlike drones and related devices in at least five provinces in recent years.

One part of the country that has seen the new technology used extensively is the Xinjiang Uygur autonomous region in China's far west. The vast area, which borders Mongolia, Russia, Kazakhstan, Kyrgyzstan, Tajikistan, Afghanistan, Pakistan and India, is home to a large Muslim population and has long been viewed by Beijing as a hotbed for separatism. As a result, the region and its people have been subjected to heavy surveillance from the central government.