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Levels of abstraction in orangutan (Pongo abelii) categorization.

, and . Journal of Comparative Psychology, 118 (1): 3 (2004)

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Levels of abstraction in orangutan (Pongo abelii) categorization., and . Journal of Comparative Psychology, 118 (1): 3 (2004)Natural concepts in a juvenile gorilla (Gorilla gorilla gorilla) at three levels of abstraction, and . Journal of the experimental analysis of behavior, 78 (3): 315--332 (2002)