GUESTS: IRENE MAXINE PEPPERBERG Cognitive Ethologist (studies animal behavior). Visiting Associate Professor, MIT Media Laboratory Author of The Alex Studies: Cognitive and Communicative Abilities of Grey Parrots (Harvard Univ. Press). MARC HAUSER Professor of Psychology, Harvard University Author of Wild Minds: What Animals Really Think (Henry Holt) Animal lovers have always thought their pets could communicate. New research indicates some animals have the ability to use and process language more than scientists previously thought possible. What do we really know about the communication abilities of animals? Join Juan Williams and guests for a look at how animals think.