Juan Carlos Munoz / Aerial view of the River Kinabatangan and riverine tropical rainforest, Sabah, Malaysia, Borneo, Asia.

Tim Laman / Aerial view of an oxbow lake in the Kinabatangan Wildlife Sanctuary, Sabah, Borneo, Malaysia

Juan Carlos Munoz / Aerial view of lowland rainforest and Kinabatangan River coloured with mineral deposits, Sabah, Malaysia . 2007

Juan Carlos Munoz / Aerial view of homes built on stilts on edge of river, Kinabatangan River, Sandakan, Sabah, Malaysia 2007

Juan Carlos Munoz / Aerial view of lowland rainforest and Kinabatangan River coloured with mineral deposits, Sabah, Malaysia . 2007

Juan Carlos Munoz / Gomantong caves with ladder for collecting Swiftlet nests, River Sungai Kinabatangan, Sabah, Borneo, Malaysia 2007

Tony Heald / Pigtail Macaques (Macaca nemestrina) crossing purpose-built "primate wires" connecting isolated patches of forest, Kinabatangan River, Sukau, Sabah, Borneo, September 2008

Tim Laman / Proboscis monkey (Nasalis larvatus) female carrying baby in mid leap across a river, Kinabatangan Wildlife Sanctuary, Sabah, Malaysia, Borneo, Endangered

Tim Laman / Proboscis Monkey (Nasalis larvatus) leaping across river, about to land in the water, Kinabatangan Wildlife Sanctuary, Sabah, Malaysia, Borneo, Endangered

Tim Laman / Aerial view of rainforest along the Kinabatangan River, with clearing used by elephants visible. Kinabatangan Wildlife Sanctuary, Sabah, Malaysia, Borneo

Nick Garbutt / Bornean orang-utan (Pongo pygmaeus), male feeding on leaves in forest on banks of Kinabatangan River, Sabah, Borneo, Malaysia.

Nick Garbutt / Bornean orang-utan (Pongo pygmaeus), male feeding on leaves in forest on banks of Kinabatangan River, Sabah, Borneo, Malaysia.

Nick Garbutt / Bornean pygmy squirrel (Exilisciurus exilis) on tree trunk. Kinabatangan River, Sabah, Borneo, Malaysia.

Nick Garbutt / Borneo pygmy elephant (Elephas maximus borneensis) feeding in riparian vegetation on banks of Kinabatangan River, Sabah, Borneo, Malaysia. May.

Sylvain Cordier / Borneo pygmy elephant (Elephas maximus borneensis) Kinabatangan River, Sabah, Borneo.

Paul Williams / Proboscis monkey (Nasalis larvatus) female feeding, Kinabatangan River, Sabah, Borneo.

Paul Williams / Female Proboscis monkey (Nasalis larvatus) feeding, Kinabatangan River, Sabah, Borneo.

Paul Williams / Proboscis monkey (Nasalis larvatus) feeding, Kinabatangan River, Sabah, Borneo.

Paul Williams / Proboscis monkey (Nasalis larvatus) female, Kinabatangan River, Sabah, Borneo.

Nick Garbutt / Red-legged crake (Rallina fasciata) roosting in the rainforest understorey. Kinabatangan River, Sabah, Borneo. September.

Nick Garbutt / Black-and-red broadbills (Cymbirhynchus macrorhynchos) group roosting in the rainforest understorey. Kinabatangan River, Sabah, Borneo. September.

Nick Garbutt / White-crowned shama (Copsychus stricklandi) pair roosting in the rainforest understorey. Kinabatangan River, Sabah, Borneo. September. Endemic.

Nick Garbutt / Wagler's pit viper (Tropidolaemus wagleri) in riverine forest understorey. Kinabatangan River, Sabah, Borneo.

Nick Garbutt / Stork-billed kingfisher (Halcyon capensis) hunting from branch overhanging the river. Kinabatangan River, Sabah, Borneo. September.

Nick Garbutt / Stork-billed kingfisher (Pelargopsis or Halcyon capensis) hunting from branch overhanging the river. Kinabatangan River, Sabah, Borneo. September.

Nick Garbutt / Proboscis monkey (Nasalis larvatus) Riverine forest, Kinabatangan River, Sukau, Sabah, Borneo.

Nick Garbutt / Rufous-backed kingfisher (Ceyx erithaca motleyi) roosting on branch in rainforest understory. Kinabatangan River, Sabah, Borneo. September.

Nick Garbutt / Rufous-backed kingfisher (Ceyx erithaca motleyi) roosting on branch in rainforest under-story. Kinabatangan River, Sabah, Borneo. September.

Nick Garbutt / Proboscis monkey (Nasalis larvatus) climbing riverside tree. Kinabatangan River, Sabah, Borneo.

Nick Garbutt / Synchronous fire flies (Pteroptyx sp.) mangroves along the Kinabatangan River, Sabah, Borneo.

Nick Garbutt / Wagler's pit viper (Tropidolaemus wagleri) in riverine forest understory. Kinabatangan River, Sabah, Borneo.

Adrian Davies / Hornet nest (Vespa affinis) Kinabatangan River, Sabah, Borneo

Adrian Davies / Palm oil plantation extending to bank of river. Kinabatangan river, Sabah, Borneo. September 2015.

Sebastian Kennerknecht / Sunda Clouded Leopard (Neofelis diardi) researcher Andrew Hearn radio tracking, with computer showing telemetry tracks of how male stays only within forested areas along the river, while avoiding plan...

Sebastian Kennerknecht / Borneo Pygmy Elephant (Elephas maximus borneensis) females and calf grazing, Kinabatangan River, Sabah, Borneo, Malaysia

Sebastian Kennerknecht / Borneo Pygmy Elephant (Elephas maximus borneensis) mother and calf grazing, Kinabatangan River, Sabah, Borneo, Malaysia

Sebastian Kennerknecht / Sunda Clouded Leopard (Neofelis diardi) researcher Andrew Hearn looking at live trap, Kinabatangan River, Sabah, Borneo, Malaysia

Sebastian Kennerknecht / Great Egret (Ardea alba), Kinabatangan River, Sabah, Borneo, Malaysia

Sebastian Kennerknecht / African Oil Palm (Elaeis guineensis) plantation with remaining secondary lowland rainforest in foreground, Kinabatangan River, Sabah, Borneo, Malaysia

Sebastian Kennerknecht / Sunda Clouded Leopard (Neofelis diardi) researcher Andrew Hearn radio tracking from boat with other biologists, Kinabatangan River, Sabah, Borneo, Malaysia

Sebastian Kennerknecht / Borneo Pygmy Elephant (Elephas maximus borneensis) mother and calf, Kinabatangan River, Sabah, Borneo, Malaysia

Sebastian Kennerknecht / Borneo Pygmy Elephant (Elephas maximus borneensis) calf, Kinabatangan River, Sabah, Borneo, Malaysia

Sebastian Kennerknecht / Borneo Pygmy Elephant (Elephas maximus borneensis) herd in secondary lowland rainforest, Kinabatangan River, Sabah, Borneo, Malaysia

Sebastian Kennerknecht / Borneo Pygmy Elephant (Elephas maximus borneensis) males play-fighting, Kinabatangan River, Sabah, Borneo, Malaysia

Juan Carlos Munoz / Toursists in a boat moving up the River Kinabatangan through lowland rainforest, Sabah, Malaysia, Borneo.

Juan Carlos Munoz / Aerial view of the River Kinabatangan and riverine tropical rainforest, Sabah, Malaysia, Borneo, Asia.

Juan Carlos Munoz / Aerial view of the River Kinabatangan and riverine tropical rainforest, Sabah, Malaysia, Borneo, Asia.

Chien Lee / Indian Smooth-coated Otter (Lutrogale perspicillata) pair running on riverbank, Kinabatangan Wildlife Sanctuary, Borneo, Malaysia

Martin Willis / Borneo Pygmy Elephant (Elephas maximus borneensis) herd eating bamboo, Kinabatangan River, Sabah, Borneo, Malaysia

Martin Willis / Borneo Pygmy Elephant (Elephas maximus borneensis) drinking from Kinabatangan River, Sabah, Borneo, Malaysia

Martin Willis / Borneo Pygmy Elephant (Elephas maximus borneensis) eating grass at jungle edge, Kinabatangan River, Sabah, Borneo, Malaysia

Martin Willis / Borneo Pygmy Elephant (Elephas maximus borneensis) eating bamboo, Kinabatangan River, Sabah, Borneo, Malaysia

Martin Willis / Borneo Pygmy Elephant (Elephas maximus borneensis) eating bamboo, Kinabatangan River, Sabah, Borneo, Malaysia

Chris Mattison / Grasshopper nymph on water hyacinth, Kinabatangan River, Sabah, Borneo

Hiroya Minakuchi / Misty rainforest along the Kinabatangan River, Sabah, Borneo, Malaysia

Hiroya Minakuchi / Canoeing on Kinabatangan River, Sabah, Borneo, Malaysia

Loic Poidevin / Saltwater crocodile (Crocodylus porosus) Kinabatangan river, Sabah, Borneo

Suzi Eszterhas / Crab eating macaque (Macaca fascicularis) juvenile portrait, Kinabatangan River, Sabah, Borneo, Malaysia

Suzi Eszterhas / Asian Water Monitor (Varanus salvator) resting on branch over Kinabatangan River, Sabah, Borneo, Malaysia

Suzi Eszterhas / Small toothed Palm Civet (Arctogalidia trivirgata) above fruit at night, Kinabatangan River, Sabah, Borneo, Malaysia

Suzi Eszterhas / Stork billed Kingfisher (Pelargopsis capensis) Kinabatangan River, Sabah, Borneo, Malaysia

Suzi Eszterhas / Blue eared Kingfisher (Alcedo meninting) portrait, Kinabatangan River, Sabah, Borneo, Malaysia

Christophe Courteau / Road Construction for palm tree oil plantation access, close to the Kinabatangan River, Sabah Borneo, Malaysia

Christophe Courteau / Palm tree oil plantation, with palms imported from South Africa. Near the Kinabatangan River, Sabah, Malaysia. In the back-ground, the last remains of the pristine rainforest.

Christophe Courteau / Palm tree oil plantation, with palms imported from South Africa. Near the Kinabatangan River, Sabah, Malaysia. In the back-ground, the last remains of the pristine rainforest.

Christophe Courteau / Palm tree oil plantation, with palms imported from South Africa. Near the Kinabatangan River, Sabah, Malaysia. In the back-ground, the last remains of the pristine rainforest.

Christophe Courteau / Lorry / truck on a gravel road to palm tree oil plantations close to the Kinabatangan River, Sabah, Borneo, Malaysia

Christophe Courteau / Palm tree oil plantation, with palms imported from South Africa. Near the Kinabatangan River, Sabah, Malaysia. In back-ground, the last remains of the pristine rainforest.

Christophe Courteau / Palm tree oil plantation, with palms imported from South Africa. Near the Kinabatangan River, Sabah, Malaysia. In back-ground, the last remains of the pristine rainforest.

Christophe Courteau / Pipeline for loading boats with palm oil directly from a plantation close to the Kinabatangan River, Sabah, Borneo, Malaysia

Christophe Courteau / Palm Tree Oil Plantation close to the Kinabatangan River, Sabah, Borneo, Malaysia

Christophe Courteau / Palm Tree Oil Plantation close to the Kinabatangan River, Sabah, Borneo, Malaysia

Hiroya Minakuchi / Stream in rainforest, Kinabatangan River, Malaysia

Hiroya Minakuchi / Rainforest along river, Kinabatangan River, Malaysia

Hiroya Minakuchi / Borneo Pygmy Elephant (Elephas maximus borneensis) mother and offspring, Kinabatangan River, Malaysia

Hiroya Minakuchi / Borneo Pygmy Elephant (Elephas maximus borneensis) herd eating grass, Kinabatangan River, Malaysia

Hiroya Minakuchi / Borneo Pygmy Elephant (Elephas maximus borneensis) mother and juvenile bathing, Kinabatangan River, Malaysia

Hiroya Minakuchi / Borneo Pygmy Elephant (Elephas maximus borneensis) mother and baby drinking water, Kinabatangan River, Malaysia

Hiroya Minakuchi / Borneo Pygmy Elephant (Elephas maximus borneensis), Kinabatangan River, Malaysia

Hiroya Minakuchi / Borneo Pygmy Elephant (Elephas maximus borneensis) juveniles fighting, Kinabatangan River, Malaysia

Hiroya Minakuchi / Borneo Pygmy Elephant (Elephas maximus borneensis) eating grass in the water, Kinabatangan River, Malaysia

Hiroya Minakuchi / Malabar Pied-Hornbill (Anthracoceros coronatus) pair, Kinabatangan River, Malaysia

Hiroya Minakuchi / Mangroves, Kinabatangan River, Malaysia

Hiroya Minakuchi / Mangroves, Kinabatangan River, Malaysia

Juan Carlos Munoz / Aerial view of lowland rainforest and tributaries of the Kinabatangan River, Sabah, Borneo, Malaysia, April 2007

Juan Carlos Munoz / Aerial view of Kinabatangan river flowing through rainforest, Sandakan, Sabah, Borneo, Malaysia, April 2007

Suzi Eszterhas / Long-tailed Macaque (Macaca fascicularis) infant nursing, Kinabatangan River, Malaysia

Suzi Eszterhas / Long-tailed Macaque (Macaca fascicularis) sub-adult, Kinabatangan River, Malaysia

Suzi Eszterhas / Borneo Pygmy Elephant (Elephas maximus borneensis) at edge of rainforest, Kinabatangan River, Malaysia

Suzi Eszterhas / Borneo Pygmy Elephant (Elephas maximus borneensis) in tall grasses, Kinabatangan River, Malaysia

Suzi Eszterhas / Common Water Monitor (Varanus salvator) resting on branch, Kinabatangan River, Malaysia

Suzi Eszterhas / Small-toothed Palm Civet (Arctogalidia trivirgata) in tree at night, Kinabatangan River, Malaysia

Hiroya Minakuchi / Kinabatangan River flowing through tropical rainforest, Borneo, Malaysia

Juan Carlos Munoz / Tourist lodge with Ratan ladders used for climbing in the Gomantong caves, River Sungai Kinabatangan, Sabah, Borneo, Malaysia . 2007

Juan Carlos Munoz / Fisherman throwing fishing net, Kinabatangan River, Sabah, Borneo, Malaysia 2007

Juan Carlos Munoz / Inside the Gomantong caves with ladder for collecting Swiftlet nests, River Sungai Kinabatangan, Sabah, Borneo, Malaysia 2007