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Janmaat, KRL. 2006. Fruits of enlightenment. Fruit localization strategies in wild mangabey monkeys. Ph.D. thesis, University of St. Andrews.
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Janmaat, K.R.L., Ban, S. D., Boesch, C. (2013). Chimpanzees use long-term spatial memory to monitor large fruit trees and remember feeding experiences across seasons. Animal Behaviour, http://dx.doi.org/10.1016/j.anbehav.2013.09.021, published online 23 October 2013.