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ALISON M. ASHBURY, - and MARY ROSE C. POSA, - and LYNDA P. DUNKEL, - and BRIGITTE SPILLMANN, - and S. SUCI UTAMI ATMOKO, - and CAREL P. VAN SCHAIK, - and MARIA A. VAN NOORDWIJK, - (2015) Why Do Orangutans Leave the Trees? Terrestrial Behavior Among Wild Bornean Orangutans (Pongo pygmaeus wurmbii) at Tuanan, Central Kalimantan. American Journal of Primatology.