Anup Shah / Juvenile orang utan (Pongo abelii) swinging on liana Gunung Leuser NP Sumatra Indonesia

Anup Shah / Juvenile orang utan (Pongo abelii) swinging on liana Gunung Leuser NP Sumatra Indonesia

Anup Shah / Orang utan in forest, (Pongo abelii) Gunung Leuser NP, Indonesia

Anup Shah / Sihoutte of Orang utan moving through forest, (Pongo abelii) Gunung Leuser NP, Indonesia

Anup Shah / Orang utan {Pongo abelii} Suma reunited with baby moring through trees. Gunung Leuser NP Sumatra Indonesia.

Anup Shah / Chimpanzee swinging through trees, Gombe NP, Tanzania 2003 'Fanni'

Pete Oxford / Long haired / White bellied spider monkey hanging in tree by tail {Ateles belzebuth} Manu NP,

Justine Evans / White handed gibbon, alpha male hanging in tree {Hylobates lar} Khao Yai NP, Thailand 'Cassius'

Karl Ammann / Chimpanzee swinging through trees at Chimfunshi sanctuary, Zambia

Anup Shah / White handed gibbon hanging from branch {Hylobates lar} C

Duncan Murrell / Bornean orangutan (Pongo pygmaeus) juvenile male brachiating through trees, Sabangau (peat-swamp) Forest, Central Kalimantan, Indonesia.

Staffan Widstrand / Wild Wonders of China / Golden snub-nosed monkey (Rhinopithecus roxellana) hanging on branch, Foping Nature Reserve, Shaanxi, China. Endangered species