The Darjeeling Limited moviemaker was desperate to adapt the 1970s children's tale, and after a lengthy battle, has finally begun work on the animated movie in London.
He says, "It was one of my favorite books as a child. I have been trying to make this film for eight years.
"There's a whole new bit at the start and a new section at the end. But we've tried to do something that Roald Dahl would love."
George Clooney has signed up to provide the voice of Mr. Fox in the film.
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