Audio from the Elephant Listening Project was released in 2013. It features the moment an elephant was killed by poachers. The low-frequency recording, sounding muffled, was captured by microphones set up by the project in the forests of Gabon and the Republic of Congo. The aim was to monitor the sounds that forest elephants use to communicate, which humans can sometimes feel but barely hear. Instead, the project heard the sounds of an elephant dying.