King Kong actor Andy Serkis painlessly researched the way the terrifying beast should kill his victims - because he wanted his character to be as realistic as possible.

Serkis provides motion capture and facial expressions for the computer generated King Kong in the new movie - and was determined his Kong should behave like a real animal.

He says, "My angle is giving the gorilla as much truthfulness as possible, so people will think he is a real gorilla.

"He doesn't eat people, he kills people. He's savage.

"When they sacrifice the brides to him he connects that they are female and he is male - there is no doubt he understands that.

"He doesn't eat them, he rips them apart, limb from limb, because he can't mate with them. That's what drives him."