Magnus Lundgren / Wild Wonders of China / Central Yunnan black crested gibbon (Nomascus concolor jingdongensis), mother and baby hanging in canopy. Wuliangshan Nature Reserve, Jingdong, Yunnan Province, China.

Visuals Unlimited / Agile Gibbon (Hylobates agilis) face portrait, Tanjung Puting National Park, Kalimantan, Borneo, Indonesia

Staffan Widstrand / Wild Wonders of China / Eastern hoolock gibbon (Hoolock leuconedys) hanging from a branch in its arms, resting between forays through the rainforest, Gaoligongshan Nature reserve, Yunnan, China

Thomas Marent / Agile Gibbon (Hylobates agilis) pair, Camp Leaky, Tanjung Puting National Park, Indonesia

Nguyen Duc Tho / Fauna & Flora International / Cao vit gibbon (Nomascus nasutus) adult male and juvenile in rainforest tree, Vietnam. Critically endangered species, rediscovered in 2002, found only in northern Vietnam and the adjacent region of Ch...

Fauna & Flora International / Ryan Deboodt / Cao-vit gibbon (Nomascus nasutus) female hanging from branch in rainforest, Cao Vit Gibbon Species and Habitat Conservation Area (CVGSHCA), Trung Khanh, Cao Bang Province, northern Vietnam. Critically...

Fauna & Flora International / Nguyen Van Truong / Cao-vit gibbon (Nomascus nasutus) female with young brachiating in rainforest, Cao Vit Gibbon Species and Habitat Conservation Area (CVGSHCA), Trung Khanh, Cao Bang Province, northern Vietnam. Critica...

Magnus Lundgren / Wild Wonders of China / Central Yunnan black crested gibbon (Nomascus concolor jingdongensis), mother and baby swinging in canopy. Wuliangshan Nature Reserve, Jingdong, Yunnan Province, China.

Enrique Lopez-Tapia / Agile gibbon (Hylobates agilis) collecting bananas from a Camp Leakey orangutan feeding platform, Tanjung Puting National Park, Kalimantan, Borneo, Indonesia, October.

Enrique Lopez-Tapia / Agile gibbon (Hylobates agilis) carrying bananas collected from a feeding platform climbing up a tree, Tanjung Puting National Park, Kalimantan, Borneo, Indonesia, October.

Suzi Eszterhas / Agile gibbon (Hylobates agilis) in tree, Tanjung Puting National Park, Indonesia.

Suzi Eszterhas / Agile gibbon (Hylobates agilis) in tree, Tanjung Puting National Park, Indonesia.

Dong Lei / Hoolock gibbon (Hoolock leuconedys) climbing tree, Gaoligong Mountain National Nature Reserve, Tengchong county, Yunnan Province, China.

Inaki Relanzon / Agile Gibbon (Hylobates agilis) in Tanjung Puting National Park, Borneo-Kalimatan, Indonesia.

Visuals Unlimited / Agile Gibbon (Hylobates agilis) climbing on liana, Tanjung Puting National Park, Kalimantan, Borneo, Indonesia

Visuals Unlimited / Agile Gibbon (Hylobates agilis), Tanjung Puting National Park, Kalimantan, Borneo, Indonesia

Mark Taylor / Bornean white-bearded or agile gibbon, (Hylobates albibarbis) in tree, south west Borneo.

Nick Garbutt / Agile Gibbon (Hylobates agilis) resting in forest canopy, Tanjung Puting National Park, Kalimantan, Borneo.

Juan Carlos Munoz / Grey gibbon (Hylobates muelleri) hanging upside-down from branch in rainforest, using feet and hands to grip plant vine, Mount Kinabalu NP, Sabah, Borneo, Malaysia

Juan Carlos Munoz / Grey gibbon (Hylobates muelleri) hanging upside-down from branch in rainforest, using feet and hands to grip plant vine, Mount Kinabalu NP, Sabah, Borneo, Malaysia

Juan Carlos Munoz / Grey gibbon (Hylobates muelleri) walking along branch, balancing, Mount Kinabalu NP, Sabah, Borneo, Malaysia

David Pike / Agile Gibbon {Hylobates agilis} Tanjung Puting National Park, Indonesia

Rod Williams / Agile gibbon {Hylobates agilis} captive, from Indonesia, Malaysia, Thailand

Rod Williams / Agile gibbon {Hylobates agilis} young, captive, from Malaysia, Sumatra and Borneo

Pete Oxford / Agile gibbon {Hylobates agilis} captive, from SE Asia

Anup Shah / White handed gibbon running along branch {Hylobates lar}

Anup Shah / Agile gibbon {Hylobates agilis} captive, native to SE Asia, Endangered

Suzi Eszterhas / Agile Gibbon (Hylobates agilis) showing long arms, Tanjung Puting National Park, Indonesia

Thomas Marent / Agile Gibbon (Hylobates agilis), Camp Leaky, Tanjung Puting National Park, Indonesia

Thomas Marent / Agile Gibbon (Hylobates agilis) calling, Camp Leaky, Tanjung Puting National Park, Indonesia

Thomas Marent / Agile Gibbon (Hylobates agilis) in rainforest tree, Camp Leaky, Tanjung Puting National Park, Indonesia

Thomas Marent / Agile Gibbon (Hylobates agilis) in rainforest tree, Camp Leaky, Tanjung Puting National Park, Indonesia

Thomas Marent / Agile Gibbon (Hylobates agilis) in rainforest tree, Camp Leaky, Tanjung Puting National Park, Indonesia

Thomas Marent / Agile Gibbon (Hylobates agilis) in rainforest tree, Camp Leaky, Tanjung Puting National Park, Indonesia

Thomas Marent / Agile Gibbon (Hylobates agilis), Camp Leaky, Tanjung Puting National Park, Indonesia

Thomas Marent / Agile Gibbon (Hylobates agilis) portrait, Camp Leaky, Tanjung Puting National Park, Indonesia

Thomas Marent / Agile Gibbon (Hylobates agilis) hanging in tree, Camp Leaky, Tanjung Puting National Park, Indonesia

Pete Oxford / White handed gibbon swinging from branch {Hylobates lar} captive found in Far East

Thomas Marent / Agile Gibbon (Hylobates agilis) portrait, Camp Leaky, Tanjung Puting National Park, Indonesia

Thomas Marent / Agile Gibbon (Hylobates agilis) in rainforest tree, Camp Leaky, Tanjung Puting National Park, Indonesia

Thomas Marent / Agile Gibbon (Hylobates agilis), Camp Leaky, Tanjung Puting National Park, Indonesia