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Author (up) Title Year Publication Serial Volume Pages
Pepperberg, I.M. Grey parrot numerical competence: a review 2006 Animal Cognition 2448 9 377-391
Pepperberg, I.M. “Insightful” string-pulling in Grey parrots (Psittacus erithacus) is affected by vocal competence 2004 Animal Cognition 2537 7 263-266
Pepperberg, I.M. The value of the Piagetian framework for comparative cognitive studies 2002 Animal Cognition 2595 5 177-182
Pepperberg, I.M. In search of king Solomon's ring: cognitive and communicative studies of Grey parrots (Psittacus erithacus) 2002 Brain, behavior and evolution 579 59 54-67
Pepperberg, I.M. Cognitive and Communicative Abilities of Grey Parrots 2002 Current Directions in Psychological Science 580 11 83-87
Pepperberg, I.M.; Brezinsky, M.V. Acquisition of a relative class concept by an African gray parrot (Psittacus erithacus): discriminations based on relative size 1991 Journal of Comparative Psychology 3610 105 286-294