Coming down from the trees: Is terrestrial activity in Bornean orangutans natural or disturbance driven? von Ancrenaz, Marc, Sollmann, Rahel, Meijaard, Erik, Hearn, Andrew J., Ross, Joanna, Samejima, Hiromitsu, Loken, Brent, Cheyne, Susan M., Stark, Danica J., Gardner, Penny C., Goossens, Benoit, Mohamed, Azlan, Bohm, Torsten, Matsuda, Ikki, Nakabayasi, Miyabi, Lee, Shan Khee, Bernard, Henry, Brodie, Jedediah, Wich, Serge, Fredriksson, Gabriella, Hanya, Goro, Harrison, Mark E., Kanamori, Tomoko, Kretzschmar, Petra, Macdonald, David W., Riger, Peter, Spehar, Stephanie, Ambu, Laurentius N., Wilting, Andreas

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