In the forests of Africa, elephants usually get shot out of sight or hearing. But the Elephant Listening Project - a conservation group - has changed that. They put microphones deep into the forests of the DRC and Gabon, to record elephant communications. What those hidden microphones also picked up was this - the moment an elephant is gunned down by poachers.
It's a painful listen. To find out more about the Elephant Listening Project and its work, check out Nature magazine's interview with project director Peter Wrege, here.