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Author (up) Title Year Publication Serial Volume Pages
Borsari, A.; Ottoni, E.B. Preliminary observations of tool use in captive hyacinth macaws (Anodorhynchus hyacinthinus) 2005 Animal Cognition 2518 8 48-52
Gajdon, G.K.; Fijn, N.; Huber, L. Limited spread of innovation in a wild parrot, the kea (Nestor notabilis) 2006 Animal Cognition 2472 9 173-181
Huber, L.; Gajdon, G.K. Technical intelligence in animals: the kea model 2006 Animal Cognition 2085 9 295-305
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.; 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