Self-expression, to me, is something that you worked on, that you have mastered a skill to say something in the most artful way that you can. It's not just blurting stuff out and having verbal diarrhea.

I did 40 voices for Chris Wedge, the director of the first film, before coming up with the version we used. He was hard to please, I don't know why. I gave him really slow talking voices. then I thought perhaps Sid could be an Indian sounding sloth. To find out more about my character, I watched footage of sloths. I discovered that the food they store in their pouches rots and ferments and half the time they're drunk.

I walked around my apartment with food in my mouth asking myself: "How do I come up with this voice?" Then I found the voice. I called the director and said on the phone: "Guess who you're talking to Chris? Sid, that's right Sid!" And that's how I came up with the voice. That's a true story.

[Brad Furman] wants to try stuff, he's willing to try stuff. And he wants electricity on the camera. And that's what I want, I want electricity whenever I'm performing.

Voices come to me but to maintain them is hard work. They go away just as easily, so I have to remember them and that takes work. With Sid, I needed to make sure you could understand what he is saying, his enunciation. Sometimes I couldn't even say my own name [his name] in his voice. It sounds like 'Shid', it sounds a bit like he has a lisp.

We see them [animals] as the Ice Age is ending and we know that actually in the long run, they're not going to make it. And there's something beautiful about that, beautifully sad. The way the characters are woven together in the film adds to the emotion because they need each other. The message is that it doesn't matter what species you are, you can still love each other and that is a fantastic message.

Self-expression, to me, is something that you worked on, that you have mastered a skill to say something in the most artful way that you can. It's not just blurting stuff out and having verbal diarrhea.