There was once an extremely intelligent West African Gray Parrot called Alex. Alex was a famous parrot not only able to talk rather fluently but,
it now appears, also able to count objects and perform numerical
calculations, according to an article published in Animal Cognition, by
Irene Pepperberg.
Dr. Irene, who trained Alex, reports her charge had great
mathematical skills and was able to add two Arabic numerals and the
total number of objects under three cups.
She performed 12 trials asking Alex to add two Arabic numerals and
amazingly he gave the right answer nine times. When she presented him,
sequentially, with three sets of objects hidden under three cups, Alex
gave the correct answer eight out of ten times.
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