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This DVD contains four interesting and eye-opening segments. Do Animals Know Right From Wrong? - Scientists studying animal cognition are revealing the machinery of animals' moral compasses. Pigeon GPS - We know that homing pigeons can find their way back to their lofts over hundreds of miles of unfamiliar terrain. What we don't know is how they do it. Hive Genius - Investigate the inner workings of communication patterns within a giant bee colony. Profile: Laurie Santos - Yale scientist Laurie Santos is studying a community of more than 900 monkeys who live in a society that is eerily similar to our own. Can Santos' research reveal the evolutionary roots of human foibles?

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Released by PBS. See more credits.