In 2016, calamity struck Indonesia’s Riau province. A herd of around 30 wild elephants descended on the village of Muara Bungkal for two months, devouring about 50 hectares of land, and saddling the village with more than $65,000 in lost crops. RSF also uses geothermal drones to track the movements of the elephants at night, and hopes to fit collars on the remaining four Sumatran elephant herds in Riau, said Syukri