The Office creator Ricky Gervais fears his big-budget children's movie FLANIMALS will be a flop.

The British funnyman is thrilled movie bosses want to adapt his 2004 book, but remains terrified of box office failure.

He says, It's going to be a big Hollywood film. Well, I mean it's going to cost a lot, GBP80 million.

"But it could be a flop."