Why Dogs Smile and Chimpanzees Cry
Why Dogs Smile and Chimpanzees Cry (1999)

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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Rated: Unrated
Running Time:
Genre: Documentary
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