How drones are being used to protect the Amazon's dolphins

Mercury contamination from goldmining is also a concern, as is the Brazilian government’s plan to build dams throughout the Amazon basin. According to a recent paper published in Nature, 140 dams have already been built or are under construction, with plans for a further 428. These would be impassable obstacles to dolphins, isolating communities and decreasing genetic diversity. “The threats are there. They’re just under construction,” says Oliveira.
read more... https://www.theguardian.com/environment/2018/jan/26/indigenous-communities-use-drones-to-protect-amazon-river-dolphins