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Dr
Elisabetta Visalberghi and Dr
Elsa Addessi, ISTC-CNR Laboratory of Cognitive Primatology, Rome, Italy.
Prof
Dr Anja Widdig, Leipzig University and Max Planck Institute for Evolutionary Anthropology,
Leipzig, Germany
MSc
Karlijn
Gosselt and Dr Liesbeth Sterck. Department
of Behavioural Biology, Utrecht University, The Netherlands
We are most grateful to:







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