A mountain bike is a new form of transport for Lean Kha.
Thirty years ago, he was a Khmer Rouge soldier, and got around on the back of an elephant. His shooting skills later helped him to become an expert hunter.
Now, however, Lean Kha has become a conservationist.
He is the most senior community ranger for WWF's Srepok Wilderness Area Project, using his local knowledge to protect wildlife in Mondulkiri's dry forests.