Why Dogs Smile and Chimpanzees Cry

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Nature, Science Documentary hosted by Sigourney Weaver and published by Discovery Channel in 1999 - English narration

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Are animals closer to humans on an emotional level than generally has been believed? The many scientists, researchers, wildlife photographers, and other animal experts interviewed in this Discovery Channel video answer with a resounding yes. They make their case in this 93-minute documentary, narrated by actress Sigourney Weaver, with stories of despondent dogs, grieving chimps, and lab rats who laugh when tickled. The first half focuses on happy bonds between mother and child, siblings, and animals and humans. The second half delves into the darker subjects of sadness and grief, offering astounding assertions such as elephants secrete a tearlike substance when upset and search dogs finding only corpses in the Oklahoma City bombing case needed treatment for depression. While the focus is on mammals, mollusks get some air time in the form of octopuses that appear to change color according to their situation. Backing up observations with brain imaging and genetic testing, the scientists--and this film--make a compelling view for any animal lover.