Updated: Jun 7, 2020
Harvard and the Johns Hopkins University recently published a paper on the results of the cognitive ability of an African grey parrot named Griffin on how well he can remember different colored pompoms (balls) hidden under cups when shuffled (Shell game). The authors of the study are Hrag Pailian, Susan E. Carey, Justin Halberda & Irene M. Pepperberg. Griffin belongs to Dr. Irene Pepperberg at the Alex Foundation (alexfoundation.org). The title of the scientific paper is, " Age and Species Comparisons of Visual Mental Manipulation Ability as Evidence for its Development and Evolution," in Scientific Reports on May 6, 2020. The summary of the study is below.