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Token Transfers Among Great Apes (Gorilla gorilla, Pongo pygmaeus, Pan paniscus, and Pan troglodytes): Species Differences, Gestural Requests, and Reciprocal Exchange

JOURNAL OF COMPARATIVE PSYCHOLOGY (2009)

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Token Transfers Among Great Apes (Gorilla gorilla, Pongo pygmaeus, Pan paniscus, and Pan troglodytes): Species Differences, Gestural Requests, and Reciprocal Exchange

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