"In Shrek, we had to animate an ogre, a gigantic dragon, a talking donkey, a very human like princess, a gingerbread man, a puppet and so on... In ANTZ, most of the characters were ants. The big challenge was to jump from different characters and still be able to make them all perform together. Sometimes it could be hard when you're animating a human character and then the next day you might have to work on a dragon. For each character, it took us few months of testing and practice until we felt totally comfortable with the character. The fun part was when we all felt like we knew the characters and we could look at an animation test and said "That's not Shrek. Shrek would never do that." or "Yes, that's definitely Shrek.""