Paul Bertner / Caterpillar with aposematic coloration, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Assassin Bug (Acanthaspis sp) being attacked by ants, Gunung Leuser National Park, Sumatra, Indonesia

Cyril Ruoso / Sumatran orangutan (Pongo abelii) baby reaching up to mother's hand, Gunung Leuser National Park, Sumatra, Indonesia.

Cyril Ruoso / Sumatran orangutan (Pongo abelii) female holding hands with baby whilst hanging from liana. Gunung Leuser National Park, Sumatra, Indonesia.

Fiona Rogers / Sumatran orangutan (Pongo abelii) female 'Sandra' aged 22 years portrait. Gunung Leuser National Park, Sumatra, Indonesia. Apr 2012. Rehabilitated and released (or descended from those which were rele...

Fiona Rogers / Sumatran orangutan (Pongo abelii) female 'Pesec' aged 28 years portrait. Gunung Leuser National Park, Sumatra, Indonesia. Apr 2012. Rehabilitated and released (or descended from those which were relea...

Fiona Rogers / Sumatran orangutan (Pongo abelii) mature male 'Halik' aged 26 years lying down - portrait. Gunung Leuser National Park, Sumatra, Indonesia. Apr 2012. Rehabilitated and released (or descended from thos...

Anup Shah / Sumatran orangutan (Pongo abelii) female 'Jaki' aged 16 years with baby daughter 'Jodi' aged 2-3 years - portrait. Gunung Leuser National Park, Sumatra, Indonesia. Rehabilitated and released (or desce...

Anup Shah / Sumatran orangutan (Pongo abelii) female 'Juni' aged 12 years swinging from a liana. Gunung Leuser National Park, Sumatra, Indonesia. Rehabilitated and released (or descended from those which were rel...

Anup Shah / Sumatran orangutan (Pongo abelii) mature male 'Halik' aged 26 years sitting in a forest clearing watched from a tree by female 'Juni' aged 12 years. Gunung Leuser National Park, Sumatra, Indonesia. Re...

Fiona Rogers / Sumatran Orangutan (Pongo abelii) twenty-four year old female, named Ratna, playing with her female baby, named Global, Gunung Leuser National Park, Sumatra, Indonesia

Fiona Rogers / Sumatran Orangutan (Pongo abelii) twenty-six year old male, named Halik, biting lip, Gunung Leuser National Park, Sumatra, Indonesia

Fiona Rogers / Sumatran Orangutan (Pongo abelii) twenty-six year old male, named Halik, Gunung Leuser National Park, Sumatra, Indonesia

Cyril Ruoso / Sumatran Orangutan (Pongo abelii) mother and young, Gunung Leuser National Park, Sumatra, Indonesia

Konrad Wothe / Orang-Utan (Pongo pygmaeus) lowering itself from a branch head-first into water. Gunung Leuser National Park, Sumatra.

Suzi Eszterhas / Sumatran Orangutan (Pongo abelii) two and a half year old baby calling, Gunung Leuser National Park, north Sumatra, Indonesia

Suzi Eszterhas / Sumatran Orangutan (Pongo abelii) mother and playful one and a half year old baby, Gunung Leuser National Park, north Sumatra, Indonesia

Suzi Eszterhas / Sumatran Orangutan (Pongo abelii) nine month old baby playing in tree, Gunung Leuser National Park, north Sumatra, Indonesia

Anup Shah / Juvenile orang utan {Pongo abelii} Gunung Leuser NP Sumatra Indonesia

Anup Shah / Orang utan (Pongo abelii) mother with baby, Gunung Leuser NP, Indonesia.

Anup Shah / Sumatran Orang utan 'kissing' young {Pongo pygmaeus abelii} Gunung Leuser NP, Sumatra, Indonesia

Anup Shah / Sumatran Orang utan baby hanging upsidedown in tree {Pongo pygmaeus abelii} Gunung Leuser NP, Sumatra, Indonesia

Anup Shah / Sumatran Orang utan baby swinging in tree {Pongo pygmaeus abelii} Gunung Leuser NP, Sumatra, Indonesia

Anup Shah / Orang utan high in tree of rainforest canopy, (Pongo abelii) Leuser NP, Indonesia

Anup Shah / Orang utan swinging through rainforest tree canopy, (Pongo abelii) Leuser NP, Indonesia

Anup Shah / Sumatran orang utan baby hanging from adult {Pongo pygmaeus abelii} Indonesia, Gunung Leuser NP, Sumatra

Anup Shah / Sumatran orang utan baby {Pongo pygmaeus abelii} Gunung Leuser NP Sumatra, Indonesia

Anup Shah / Sumatran Orang utan baby clinging to mother portrait {Pongo pygmaeus abelii} Gunung Leuser NP, Sumatra, Indonesia

Anup Shah / Sumatran Orang utan 'kissing' young {Pongo pygmaeus abelii} Gunung Leuser NP, Sumatra, Indonesia

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

Anup Shah / Orang utan baby playing with stick, (Pongo abelii) Gunung Leuser NP, Indonesia

Anup Shah / Orang utan baby hanging upside down from branch, (Pongo abelii) Gunung Leuser NP, Indonesia

Anup Shah / Orang utan baby licking sap, (Pongo abelii) Gunung Leuser NP, Indonesia

Anup Shah / Orang utan baby on mother, (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 mother & baby {Pongo abelii} swinging from liana Gunung Leuser NP, Indonesia

Anup Shah / Orang utan mother with baby suckling, (Pongo abelii) Gunung Leuser NP, Indonesia

Anup Shah / Orang utan mother with baby, (Pongo abelii) Gunung Leuser NP, Indonesia

Anup Shah / Orang utan mother with baby in rainforest, (Pongo abelii) Gunung Leuser NP, Indonesia

Anup Shah / Orang utan mother with baby, (Pongo abelii) Gunung Leuser NP, Indonesia

Anup Shah / Orang utan mother with baby, (Pongo abelii) female chewing Gunung Leuser NP, Indonesia

Anup Shah / Orang utan portrait {Pongo abelii} male. Gunung Leuser NP, Indonesia

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

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

Anup Shah / Orang utan young male {Pongo abelii} standing in tree Gunung Leuser NP Indonesia

Anup Shah / Orang utan (Pongo abelii) young male portrait. Gunung Leuser NP Indonesia

Anup Shah / Orang utan (Pongo abelli) young male hanging from tree, Gunung Leuser NP Indonesia

Anup Shah / Orang utan (Pongo abelii) young male resting on liana. Gunung Leuser NP Indonesia

Anup Shah / Orang utan (Pongo abelii) young male resting on liana, Gunung Leuser NP, Indonesia

Anup Shah / Orang utan (Pongo abelii) female called Suma with male baby, Gunung Leuser NP, Indonesia

Anup Shah / Orang utan (Pongo abelii) female called 'Suma', Gunung Leuser NP Sumatra, Indonesia

Anup Shah / Orang utan (Pongo abelii) female 'Edita' with baby born in 1997, Gunung Leuser NP Sumatra Indonesia

Konrad Wothe / Orangutan (Pongo pygmaeus) bathing in river while hanging upside-down from vine, Gunung Leuser National Park, Sumatra, Indonesia

Konrad Wothe / Orangutan (Pongo pygmaeus) drinking from river while hanging upside-down from vine, Gunung Leuser National Park, Sumatra, Indonesia

Suzi Eszterhas / Bira-bira tree (Terminalia sp) at rainforest replanting site for habitat restoration for Sumatran orangutans, Sei Betung Site, Gunung Leuser National Park, Indonesia

Suzi Eszterhas / Sungkai (Peronema canescensi ) at replanting site for restoration of habitat for Sumatran orangutans. Sei Betung Site, Gunung Leuser National Park, Indonesia

Suzi Eszterhas / Ahmad Azhari (Coordinator for Conservation) with bira-bira tree (Terminalia sp.) At rainforest replanting site for habitat restoration for Sumatran orangutans. Sei Betung Site, Gunung Leuser National...

Suzi Eszterhas / Poisoned palm tree (Arecaceae) as part of a replanting project, converting palm plantations back to natural forest. Cordinated by the Sumatran Orangutan Society. Sei Betung Site, Gunung Leuser Nationa...

Suzi Eszterhas / Poisoned palm tree (Arecaceae) as part of a replanting project, converting palm plantations back to natural forest. Cordinated by the Sumatran Orangutan Society. Sei Betung Site, Gunung Leuser Nationa...

Laurie Hedges / Male Sumatran orangutan (Pongo abelii) eating termites from a nest in a rainforest, Leuser Ecosystem, Sumatra, Indonesia.

Suzi Eszterhas / Seedlings in nursery at rainforest replanting site, coordinated by Sumatran Orangutan Society. Sei Betung Site, Gunung Leuser National Park, Sumatra, Indonesia.

Suzi Eszterhas / Seedlings in nursery at rainforest replanting site, coordinated by Sumatran Orangutan Society. Sei Betung Site, Gunung Leuser National Park, Sumatra, Indonesia.

Suzi Eszterhas / Ahmad Azhari (Coordinator for Conservation, Sumatran Orangutan Society) with Mata 'U seedling (Afzelia xylocarpa) at replanting site, for restoration of Sumatran orangutans habitat. Sei Betung Sit...

Suzi Eszterhas / Ahmad Azhari (Coordinator for Conservation, Sumatran Orangutan Society) with meranti tembaga seedling (Shorea leprosula), at replanting site for restoration of Sumatran orangutan habitat. Sei Betung S...

Suzi Eszterhas / Bira-bira tree (Terminalia sp.) growing at rainforest replanting site, coordinated by Sumatran Orangutan Society, for Sumatran orangutan habitat restoration. Sei Betung Site, Gunung Leuser National Pa...

Suzi Eszterhas / Ahmad Azhari (Coordinator for Conservation, Sumatran Orangutan Society) holding turi-turi plant seedling, at replanting site for restoration of Sumatran orangutan habitat. Sei Betung Site, Gunung Leus...

Suzi Eszterhas / Poisoned palm tree (Arecaceae) as part of a replanting project, converting palm plantations back to natural forest. Cordinated by the Sumatran Orangutan Society. Sei Betung Site, Gunung Leuser Nationa...

Paul Bertner / Spider web, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Beetle larva, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Millipede, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Scale insects with waxy extrusions, Gunung Leuser National Park, Sumatra, Indonesia

Paul Williams / Sumatran orangutan (Pongo abelii) female with very young baby, Gunung Leuser National Park, Sumatra, Indonesia

Paul Williams / Sumatran Orangutan (Pongo abelii) female with very young baby, Gunung Leuser National Park, Sumatra, Indonesia

Paul Williams / Sumatran Orangutan (Pongo abelii) resting in her nest. Gunung Leuser National Park, Sumatra, Indonesia

Paul Williams / Sumatran Orangutan (Pongo abelii) female with very young baby, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Spider web, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Trilobite Beetle (Platerodrilus sp) neotenic female remains in her larval form even when mature, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Trilobite Beetle (Platerodrilus sp) neotenic female remains in her larval form even when mature, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Ant (Odontomachus sp) carrying each other to conserve energy, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Ant (Odontomachus sp), Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Fruit Fly (Tephritidae) pair mating, with mite on back, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Froghopper (Cercopidae) nymph in cuckoospit froth, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Spiderlings, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Snail with red eye stalks, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Snail with red eye stalks, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Centipede (Scolopendra sp), Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / River Toad (Bufo asper), Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Planthopper (Ricaniidae) nymph, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Spiny Ant (Polyrhachis sp), Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Spiny Ant (Polyrhachis sp), Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / David Bowie Huntsman Spider (Heteropoda davidbowie), Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / David Bowie Huntsman Spider (Heteropoda davidbowie), Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Looper Moth (Geometridae) caterpillar, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Dead Leaf Katydid (Orophus tessellatus), Bukit Barisan Selatan National Park, Sumatra, Indonesia

Paul Bertner / Lantern Fly (Pyrops ruehli), Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Flatid Planthopper (Flatidae), Gunung Leuser National Park, Sumatra, Indonesia