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The Alex Studies is written by Irene Maxine Pepperberg and published by Harvard University Press. It's available with International Standard Book Number or ISBN identification 0674255461 (ISBN 10) and 9780674255463 (ISBN 13).
Twenty years ago Pepperberg set out to discover whether large-brained, highly social parrots were capable of mastering complex cognitive concepts and the rudiments of referential speech. This book represents the long-awaited synthesis of the studies constituting one of the landmark experiments in modern comparative psychology.