Not so, Tami Jochem, a senior mammal keeper at the Dallas Zoo, goes through a training routine with Patrick, a 19-year-old Silverback gorilla, at the zoo on March 2, 2010. While training sessions provide extra mental stimulation for the animal, Patrick has a choice of whether he wants to take part, and only positive reinforcement is given by Jochem. (Andy Jacobsohn/The Dallas Morning News)
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