It wouldn't be a proper movie review without mentioning the score. Alexandre Desplat I commend you. I'm just going to throw the word whimsical out there. Give these tracks a listen, and you'll understand what I mean by that. The tone is so positively happy and upbeat that if you listen for too long, you might start punching things or start skipping down your driveway. The side effects vary from either spectrum.
Mr. Fox In The Fields
High-Speed French Train
Jimmy Squirrel And Co.
For your viewing pleasure you can watch the movie here, and to satiate your auditory needs you can download the soundtrack here.