In 1997, DreamWorks partnered with Aardman Animations, a British stop-motion animation studio, to co-produce and distribute "Chicken Run" (2000), a stop-motion film already in pre-production. Two years later they extended the deal for an additional four films. With Aardman doing stop-motion and the existing traditional and computer productions, they covered all three major styles of animation. This partnership had DreamWorks participating in the production of stop-motion films in Bristol, and also had Aardman participating in some of the CGI films made in the United States.