I found this info on Drone Survival Guide
TWENTY-FIRST CENTURY BIRDWATCHING
Our ancestors could spot natural predators from far by their silhouettes. Are we equally aware of the predators in the present-day? Drones are remote-controlled planes that can be used for anything from surveillance and deadly force, to rescue operations and scientific research. Most drones are used today by military powers for remote-controlled surveillance and attack, and their numbers are growing. The Federal Aviation Administration (FAA) predicted in 2012 that within 20 years there could be as many as 30.000 drones flying over U.S. Soil alone. As robotic birds will become commonplace in the near future, we should be prepared to identify them. This survival guide is an attempt to familiarise ourselves and future generations, with a changing technological environment.