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Published online by Cambridge University Press: 18 May 2010
Alex's performance was impressive because he was the first bird to demonstrate such abilities, but I was more intrigued by the type labeling errors that he was making than by his success. The reason was that the errors suggested something about how he might be processing information.
Pepperberg (1999, p. 48)… they were criticized for being unscientific and performing uncontrolled experiments. In science, there's nothing worse than an experiment that's uncontrolled.
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