Why Dogs Smile and Chimpanzees Cry

  • 2000
  • TV-PG

Animal behavior and emotions, from happiness to sorrow, are investigated by researchers. Included: the bond between a mother and her offspring; altruistic behavior. Also: the evolution of the mammalian brain. Sigourney Weaver narrates.

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Animal behavior and emotions, from happiness to sorrow, are investigated by researchers. Included: the bond between a mother and her offspring; altruistic behavior. Also: the evolution of the mammalian brain. Sigourney Weaver narrates.

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