The orang-utan and rhinoceros in North Sumatra

In May-June 1964, he made another survey in the area where 4 years ago Sumatran rhino were captured by Ryhiner, Skafte and others. He made 2 journeys into the interior, one up the Siak River and the other 100 miles to the south. Although accompanied by guides who had been with Skafte and who took him to places where rhino could be expected, he found no trace of the animals at all, and no evidence of poaching. What they did find was vast areas where the primary forest had been, and was still being, cut down and many square miles of felled timber. The rhinos had been driven by their loss of habitat into remote areas well guarded by the extensive swamp forests in the low lying parts.