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Our primate cousins are much smarter than you might imagine. Just like us they use tools, solve problems, and even have emotions. George witnesses the largest monkey party in the world, goes to orangutan school in Sumatra and meets a bonobo that can light a fire to toast its own marshmallows. In Thailand long-tailed macaques floss their teeth with human hair. Chimps pass on customs through generations and in India adrenaline fuelled monkeys take extreme sports to a surprisingly human level.