2002 - The Alex Studies Cognitive and Communicative Abilities of Grey Parrots (Paperback) → Hardcover ISBN-13: 9780674008069 ISBN-10: 0674008065 Genres: Health, Fitness & Dieting, Reference, Science & Math, Engineering & Transportation, Outdoors & Nature 1 2000 - The Alex Studies Cognitive and Communicative Abilities of Grey Parrots (Hardcover) → Paperback ISBN-13: 9780674000513 ISBN-10: 067400051X Genres: Health, Fitness & Dieting, Reference, Science & Math, Engineering & Transportation, Outdoors & Nature ? |