Andrew Walmsley / Sumatran orangutan (Pongo abelii) mother and baby Bukit Lawang, North Sumatra.

Jabruson Motion / Conservation workers carrying a sedated Sumatran orangutan (Pongo abelii) towards vehicles and a transport box, part of a relocation programme, Sei Serdang, Prima, Batang Serangan, Langkat, North Suma...

Tim Laman / Tapanuli Orangutan (Pongo tapanuliensis). Togus, adult flanged male Batang Toru Forest Sumatran Orangutan Conservation Project North Sumatran Province Indonesia

Tim Laman / Tapanuli Orangutan (Pongo tapanuliensis). Togus, adult flanged male. Batang Toru Forest, Sumatran Orangutan Conservation Project, North Sumatran Province, Indonesia.

Tim Laman / Tapanuli Orangutan (Pongo tapanuliensis) Beti, juvenile female, daughter of Beta, in the trees, Batang Toru Forest, Sumatran Orangutan Conservation Project, North Sumatran Province, Indonesia

Tim Laman / Tapanuli orangutan (Pongo tapanuliensis) Togus, adult flanged male, Batang Toru Forest. Sumatran Orangutan Conservation Project, North Sumatran Province, Indonesia.

Paul Williams / Sumatran tiger (Panthera tigris sumatrae) close up portrait, captive.

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

Tim Fitzharris / Sumatran Orangutan (Pongo abelii) male, native to Sumatra

Paul Bertner / Painted Indonesian Treefrog (Nyctixalus pictus), Bukit Barisan Selatan National Park, Sumatra, Indonesia

Paul Bertner / Looper Moth (Geometridae) caterpillar, Bukit Barisan Selatan National Park, Sumatra, Indonesia

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