Reasoning by inference: Further studies on exclusion in grey parrots (Psittacus erithacus) von Pepperberg, Irene M., Koepke, Adrienne, Livingston, Paige, Girard, Monique, Hartsfield, Leigh Ann

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A Study of Executive Function in Grey Parrots (Psittacus erithacus): Experience Can Affect Delay of Gratification von Pepperberg, Irene M., Hartsfield, Leigh Ann

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Initial Evidence for Eliciting Contrafreeloading in Grey Parrots (Psittacus erithacus) via the Opportunity for Playful Foraging von Smith, Gabriella E., Greene, Diana, Hartsfield, Leigh Ann, Pepperberg, Irene M.

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Can Grey Parrots (Psittacus erithacus) Succeed on a "Complex" Foraging Task Failed by Nonhuman Primates (Pan troglodytes, Pongo abelii, Sapajus apella) but Solved by Wrasse Fish (L... von Pepperberg, Irene M, Hartsfield, Leigh Ann

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Piagetian Liquid Overconservation in Grey Parrots (Psittacus erithacus) von Cornero, Francesca M., Hartsfield, Leigh Ann, Pepperberg, Irene M.

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Piagetian Liquid Conservation in Grey Parrots (Psittacus erithacus) von Pepperberg, Irene M, Gray, Suzanne L, Lesser, Justin S, Hartsfield, Leigh Ann

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