Throughout human history, people have always sought ways to achieve an altered state of mind by getting high. It seems great apes may have done this too.
Researchers from the University of Michigan have revealed that adolescent chimpanzees also take more risks and are more likely to throw tantrums than older apes.
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Wild chimp caught doing something previously thought unique to humans hulldailymail.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from hulldailymail.co.uk Daily Mail and Mail on Sunday newspapers.