Number comprehension by a grey parrot (Psittacus erithacus), including a zero-like concept.

@article{Pepperberg2005NumberCB,
  title={Number comprehension by a grey parrot (Psittacus erithacus), including a zero-like concept.},
  author={Irene M. Pepperberg and Jesse D Gordon},
  journal={Journal of comparative psychology},
  year={2005},
  volume={119 2},
  pages={
          197-209
        }
}
A Grey parrot (Psittacus erithacus) that was able to quantify 6 item sets (including subsets of heterogeneous groups, e.g., blue blocks within groupings of blue and green blocks and balls) using English labels (I. M. Pepperberg, 1994a) was tested on comprehension of these labels, which is crucial for numerical competence (K. C. Fuson, 1988; see also record 1987-98811-000). He was, without training, asked "What color/object [number]?" for collections of various simultaneously presented… 
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Ordinality and inferential abilities of a grey parrot (Psittacus erithacus).

  • I. Pepperberg
  • Computer Science
    Journal of comparative psychology
  • 2006
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Processing of the Müller-Lyer Illusion by a Grey Parrot (Psittacus Erithacus)

Alex, a Grey parrot (Psittacus erithacus) who identifies the bigger or smaller of two objects by reporting its color or matter using a vocal English label and who states “none” if they do not differ…

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This work examined whether a nonhuman might succeed in an experiment based on probabilistic reasoning, specifically, the ability to make inferences about a sample based on information about a population.

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Data is reviewed for a Grey parrot that has been shown to quantify sets of up to and including six items using vocal English labels, to comprehend these labels fully, and to have a zero-like concept.
...

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