The Alex Studies: Cognitive and Communicative Abilities of Grey Parrots by Irene Maxine Pepperberg (Paperback, 2002)

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< p> Can a parrot understand complex concepts and mean what it says?. Since the early 1900s, most studies on animal-human communication have focused on great apes and a few cetacean species. Birds were rarely used in similar studies on the grounds that they were merely talented mimics--that they were, after all, "birdbrains.".