Reasoning by inference: further studies on exclusion in grey parrots (Psittacus erithacus).

  title={Reasoning by inference: further studies on exclusion in grey parrots (Psittacus erithacus).},
  author={Irene M. Pepperberg and Adrienne Koepke and Paige Livingston and M. Girard and Leigh Ann Hartsfield},
  journal={Journal of comparative psychology},
  volume={127 3},
Grey parrot (Psittacus erithacus) abilities for visual inferential reasoning by exclusion were tested in two experiments. The first replicated the Grey parrot study of Mikolasch, Kotrschal, and Schloegl (2011, African Grey Parrots (Psittacus erithacus) use inference by exclusion to find hidden food. Biology Letters, 7, 875-877), which in turn replicated that of Premack and Premck (1994, Levels of causal understanding in chimpanzees and children. Cognition, 50, 347-362) with apes, to learn if… 

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