Journal Article
Ashbury, A. M.; Posa, M. R. C.; Dunkel, L. P.; Spillmann, B.; Atmoko, S. S. U.; van Schaik, C. P.; van Noordwijk, M. A.: Why do orangutans leave the trees? Terrestrial behavior among wild Bornean orangutans (Pongo pygmaeus wurmbii) at Tuanan, Central Kalimantan. American Journal of Primatology
77 (11), pp. 1216 - 1229 (2015)