{"fact":"Researchers used drones to peek into crow nests, counting eggs and chicks, minimizing disturbance to the birds and gaining valuable data on their breeding success.","context":"After we localized the active nests, we monitored them to determine their fate by counting the eggs or chicks in the nest. For the monitoring, we used an Unmanned Aerial System (UAS), a small, foldable and lightweight (weight: 249 g) drone… The nests were approached by car or by foot, and then the content was checked with the camera of the drone.","source":"Petra Pal'adi; Isma Benmazouz; Szabolcs Lengyel; L'aszl'o Köv'er, The impact of population management on urban and rural Hooded Crow populations, 10.34101/actaagrar/2/13015","index":604}