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The Alex Studies: Cognitive and Communicative Abilities of Grey Parrots by Irene Maxine Pepperberg (Paperback, 2002)
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Author: By Pepperberg, Irene Maxine. Since the early 1900s, most studies on animal-human communication have focused on great apes and a few cetacean species. Alex Studies: Cognitive and Communicative Abilities of Grey Parrots.