Adapting the facial action coding system for chimpanzees (Pan troglodytes) to bonobos (Pan paniscus): the ChimpFACS extension for bonobos by Catia Correia-Caeiro, Paul Henrik Kuchenbuch, Linda S. Oña, Franziska Wegdell, Maël Leroux, André Schuele, Jared Taglialatela, Simon Townsend, Martin Surbeck, Bridget M. Waller, Katja Liebal

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