Sumatran rhinoceros are a solitary and secretive species (5). They occupy home ranges that are marked conspicuously with faeces, urine and soil scrapes (3). Individuals reach sexual maturity at 6 to 8 years of age and births occur during the wet season, which runs from October to May (3). A single calf is born, and is weaned after around 16 months. The inter-birth interval is around 3 - 4 years (3). Individuals spend the day in wallows, allowing the mud to cool their skin and protect it from drying out (5). Foraging occurs either at night or during the cool of the early morning and evening; young saplings constitute the preferred food and these trees are cut down and trampled on before being eaten (3). Essential minerals are obtained from salt licks and these are a requirement for each home range (4).