"I do the Gollum voice when they don't go to bed," Andy Serkis laughed and told UPI's Karen Butler in a recent interview.
Asked what his children think of his unusual job, the 39-year-old British actor recalled a day when his daughter Ruby, then 2, visited movies' New Zealand set and saw him in his Gollum makeup and prosthetics.
"I was completely unrecognizable," he said. "I even had contact lenses in and Ruby looks at me and goes, 'Silly Daddy.' And since then whenever I was going on set it was like, 'What is Daddy doing today at work? Is he crawling around?'"
Acclaimed for his "virtual performance" in "The Lord of the Rings" movies, Serkis will next be seen in "13 Going on 30" opposite Jennifer Garner.