Benjamin visited the Los Angeles set in April for two days with his two children, Milo aged 10 and Ella aged eight.
During the visit the family met Oscar-winner Matt Damon who Benjamin described as being a "really genuine" person and revealed the two men enjoyed a chat about "recycling and the environment".
The Hollywood actor also posed for photographs with Benjamin and the children wearing a Dartmoor Zoo T-shirt.
"He's an actor with a brain and a conscience," Benjamin said.
Benjamin said while he hasn't yet seen the finished film, he likes the atmosphere of the production and said it feels "familiar". "I see echoes of me in the character which is quite surreal," Benjamin added of the film which is based on his memoir 'We Bought A Zoo'.
[Director George] Miller was happy to have the opportunity to pair Damon and Pitt in the recording studio to capture both their irrepressible banter...and their singing. "They were really very free, working off each other, because they know each other so well. Matt Damon can sing, and Brad Pitt made it really clear upfront he couldn't. But Brad just said, 'This is a no-shame zone; I'm just going to go out there and give it a go,' and he did remarkably well. His singing is in the movie."
Damon admits, "The singing was a bit of a surprise. It was fun to just go for it and say, 'What the hell?' It's definitely not my strong suit, but I figured, you gotta go loud or go home."
Doug Mitchell adds, "We learned later on that Brad's and Matt's kids are fans of the first film, and I think it is safe to say that they had a lot to do with them taking the roles."
One should never undervalue the contribution of the small. Filmmakers learned that lesson, as Bill Miller comments, "Do not underestimate the power of children to pester their parents to act in a film. Matt Damon told us he hadn't even cracked open the screenplay to 'Happy Feet Two' before his daughter said, 'Dad, you're doing it.' Matt really had no choice."