Israel’s Ninox Robotics and Bluebird Aerosystems are employing Israeli drones with thermal imaging to guard farms from pests such as kangaroos and wild dogs. It saves farmers hundreds of thousands of dollars’ worth of sheep, plus hours spent defending them.
http://www.forbes.com/sites/jlim/2015/08/01/drones-being-tested-to-fight-against-farm-pests/