The Croods background creation

The film was prepared for a total of about 8 years. In 2005, Adelman Animation, which originally owned the copyright of the film, began to cooperate with DreamWorks Animation and decided to jointly produce a cartoon called "". Subsequently, DreamWorks Animation invited Kirk de Mico and John Kris to write the script for the film, and the two created a draft of the script about cavemen. In January 2007, Adelman Animation Company and DreamWorks Animation Company terminated their cooperation, and the copyright of the film began to be solely in charge of DreamWorks Animation Company; in March, Chris Sanders joined DreamWorks Animation Company and became responsible Director of the film; under the guidance of Chris Sanders, the script was drastically rewritten. In 2008, due to Chris Sanders' participation in the production of "How to Train Your Dragon", the production plan for the film was postponed. In 2009, the film was officially named "Crazy Primitives" and is scheduled to be released in 2012. In 2011, due to production progress, the film was postponed again until 2013.