Pepperberg (1994) has shown that Alex, an African grey parrot, can correctly report, for example, the way in which a green, wooden triangle and a blue, wooden triangle differ from one another. These experiments suggest that at least some nonprimates may be able to acquire

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Pepperberg's experiments with Alex the parrot demonstrate the ability to distinguish and articulate differences between objects, indicating the acquisition of concepts, not just simple learned behaviors or responses.

Pepperberg (1994) Has Shown That Alex, an African Grey Parrot