The latest instalment in the Planet of the Apes film franchise opens in the US on Friday. The rubber masks of the 60s and 70s films have been discarded in favour of motion capture suits and CGI. But how much did science inform the new movie's portrayal of our close relatives?
In a career spanning nearly 40 years, Frans de Waal has cemented a reputation as one of the leading authorities on the behaviour of great apes.
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