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Russon, A. E., Handayani, D. P., Kuncoro, P., & Ferisa, A. (2007). Orangutan leaf-carrying for nest-building: toward unraveling cultural processes. Anim. Cogn., 10(2), 189–202.
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Van Schaik, C. (2006). Why are some animals so smart? Sci Am, 294(4), 64–71.
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