Roland Seitre / Muller's Bornean Gibbon (Hylobates muelleri) in tree, native to Borneo

Roland Seitre / Muller's Bornean Gibbon (Hylobates muelleri) in tree, native to Borneo

Juan Carlos Munoz / Grey gibbon (Hylobates muelleri) swinging from branch in rainforest and using foot to grip plant vine, Mount Kinabalu NP, Sabah, Borneo, Malaysia

Anup Shah / Grey gibbon portrait

Chien Lee / Muller's Bornean Gibbon (Hylobates muelleri), Tawau Hills Park, Sabah, Malaysia

Konrad Wothe / East Bornean gray gibbon (Hylobates muelleri funereus / Hylobates funereus) in rainforest, Sabah, Borneo, Malaysia

Thomas Marent / Muller's Bornean Gibbon (Hylobates muelleri) pair jumping, Tabin Wildlife Reserve, Sabah, Borneo, Malaysia

Juan Carlos Munoz / Grey gibbon (Hylobates muelleri) swinging through trees, Kinabalu National Park, Borneo.

Cyril Ruoso / M?ller's Bornean Gibbon (Hylobates muelleri) in tree, native to southeast Asia

Jouan & Rius / Muller's bornean / Grey gibbon (Hylobates muelleri) calling in rainforest, Borneo, Sarawak, Malaysia

Chien Lee / M?ller's Bornean Gibbon (Hylobates muelleri) juvenile, Bau, Malaysia

Justine Evans / Alpha female Bornean Muller's / Grey gibbon (Hylobates muelleri) holding fruit in foot hanging from a fruiting fig tree, Danum Valley, Sabah, Borneo, Endangered species