I had to work with Ben Mendelsohn who's one of the great actors of our time. I had a lot of scenes with him and I was thrilled to be on the set with him; I just wanted to see how we were going to play it.

You have the hilarity and the great production. These films are distinctive because they are not just topical, they tell good stories and they let scenes play out physically. Apart from the dialogue, the characters also have a non-verbal existence, for example with Scrat.

But when you are doing an animated voice, it has to have more energy than usual or it falls flat and doesn't work. For myself, I found that I had to put myself in the same physical or emotional state as Sid, in order to make that voice sound alive and authentic. So if there was a scene in which he was running, I would be running beforehand to sound out of breath. That's important because the audience can tell intuitively if it does not sound real.

I had to work with Ben Mendelsohn who's one of the great actors of our time. I had a lot of scenes with him and I was thrilled to be on the set with him; I just wanted to see how we were going to play it.

I keep my kids out of the whole business entirely. Allegra and Lucas are five and six and I'm not interested in them doing any acting at all. I don't want my kids in show business. I keep them as far away from my work as possible.

You grow up Latin in this country and you're a third class citizen from the word go, and so you have to deal with everything around you from that point of view and trying to feel entitled.

I love theater. I think theater, when its done right, is the best, like a religious experience. When it is done badly, it's the worst thing. It's just an incredible experience.