Alan B. Bond is professor emeritus of biological sciences at the University of Nebraska and Judy Diamond is professor and curator at the University of Nebraska State Museum. Together they have studied the social behavior, cognition, and vocalizations of wild parrots for more than three decades. They are coauthors of Kea, Bird of Paradox: The Evolution and Behavior of a New Zealand Parrot and Concealing Coloration in Animals. For more on their research, please visit the website of the Center for Avian Cognition, http: //www.aviancog.org/.