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The 26-year-old `Slumdog Millionaire` star says she was disappointed after director Rupert Wyatt decided against using real primates in the movie, reported Contactmusic.
"I would have loved to spend time with apes but there wasn`t much opportunity. I did spend a lot of time reading about chimps, and also examining (primatologist) Jane Goodall`s interviews and all her YouTube video links, so I did that kind of research (sic)," Pinto said.