Juan Carlos Munoz / Proboscis monkey {Nasalis larvatus} group in lowland rainforest, Rio Sungai Kinabatangan, Sabah, Borneo, Malaysia

Juan Carlos Munoz / Proboscis monkey {Nasalis larvatus} leaping from lowland rainforest trees, Rio Sungai Kinabatangan, Sabah, Borneo, Malaysia

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

Juan Carlos Munoz / Silhouette of Proboscis monkeys {Nasalis larvatus} resting in lowland rainforest tree, Rio Sungai Kinabatangan, Sabah, Borneo, Malaysia

Suzi Eszterhas / African Oil Palm (Elaeis guineensis) harvested fruit, Sabah, Borneo, Malaysia

Suzi Eszterhas / African Oil Palm (Elaeis guineensis) harvested fruit, Labuk Bay, Sabah, Borneo, Malaysia

Sylvain Cordier / Proboscis monkey (Nasalis larvatus) female relaxing in tree, Sabah, Borneo.

Sylvain Cordier / Proboscis monkey (Nasalis larvatus) in the rain, Sabah, Borneo.

Sylvain Cordier / Proboscis monkey (Nasalis larvatus) adult female leaping with baby, Sabah, Borneo.

Sylvain Cordier / Proboscis monkey (Nasalis larvatus) male, Sabah, Borneo.

Sylvain Cordier / Proboscis monkey (Nasalis larvatus) male, Sabah, Borneo.

Sylvain Cordier / Proboscis monkey (Nasalis larvatus) female with young, Sabah, Borneo.