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3. Token transfers among great apes (Gorilla gorilla, Pongo pygmaeus, Pan paniscus, and Pan troglodytes): species differences, gestural requests, and reciprocal exchange. Pelé M, Dufour V, Thierry B, Call J. J Comp Psychol; 2009 Nov; 123(4):375-84. PubMed ID: 19929106 [Abstract] [Full Text] [Related]
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