Drones - unmanned aerial vehicle, have no human pilot onboard.  Drones are becoming the ears and eyes of scientists by surveying the ground for  signs of illegal hunting, archaeological sites and crop damage.  Drones are very cool and they're only getting smarter, less expensive and more powerful.  Here`s a good article with exampals http://jonsguide.org/best-top-mini-quadcopter-reviews/