'The Art of Ratatouille'

“Although this movie is about rats, we’re giving them human emotions, which we’re accustomed to reading on a facial anatomy that is more or less in one plane. A human’s eyebrows, eyes, nose, and mouth are basically all on one forward-facing surface, but a rat has a giant snout in the way. We gave our rats bigger eyes and pulled them further up on the head, so that you could see them with the mouth in a larger variety of head positions, something the animators asked for to help them act and tell the story.” Jason Deamer- Character Designer page16