Sumatran orangutan hanging from branch in Gunung Leuser National Park © David Coulson Canadian conservation photojournalist

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Sumatran orangutan hanging from branch in Gunung Leuser National Park © David Coulson Canadian conservation photojournalist

Sumatran orangutan hanging from branch in Gunung Leuser National Park © David Coulson Canadian conservation photojournalist

Sumatran orangutan, Pongo abelii

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