Lantern flies (Fulgoridae) pictured in the Leuser ecosystem, August 2015. Photo: Paul Hilton for RAN

A Sumatran Orangutan is pictured in the Leuser ecosystem, August 2015. Photo: Paul Hilton for RAN

A Sumatran Orangutan pictured in the Leuser ecosystem, August 2015. Photo: Paul Hilton for RAN

An aerial view of the Leuser Ecosystem, 19th November 2013. Photo: Paul Hilton