After nearly being hunted to extinction, southern right whales in Australia are making a comeback -- with the help of drones.
원문출처 : http://www.cnn.com/2016/10/13/asia/drone-southern-right-whales/index.html
원문출처 : http://www.cnn.com/2016/10/13/asia/drone-southern-right-whales/index.html