Gestural communication in wild spider monkeys (Ateles geoffroyi) by Felipe Villa-Larenas, Miquel Llorente, Katja Liebal, Federica Amici

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A first exploratory comparison of the behaviour of wolves (Canis lupus) and wolf-dog hybrids in captivity by Federica Amici, Simone Meacci, Emmeline Caray, Linda Oña, Katja Liebal, Paolo Ciucci

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Perception of optical illusions in ungulates: insights from goats, sheep, guanacos and llamas by Caterina Berardo, Ruben Holland, Alina Schaffer, Alvaro Lopez Caicoya, Katja Liebal, Paola Valsecchi, Federica Amici

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The proximate regulation of prosocial behaviour: towards a conceptual framework for comparative research by Kathrin S. Kopp, Patricia Kanngiesser, Rahel K. Brügger, Moritz M. Daum, Anja Gampe, Moritz Köster, Carel P. van Schaik, Katja Liebal, Judith M. Burkart

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GorillaFACS: The Facial Action Coding System for the Gorilla spp. by Catia Correia-Caeiro, Raquel Costa, Misato Hayashi, Anne Burrows, Jordan Pater, Takako Miyabe-Nishiwaki, Jack L Richardson, Martha M Robbins, Bridget Waller, Katja Liebal

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