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Here are a List of Unreleased Pixar films that Pixar cancelled.

List

 * Ants in the Hills (split into DreamWorks Animation's Antz and Pixar's A Bugs life by 1995)
 * The Sharkslayer (sold to DreamWorks and is renamed Shark Tale to make it less violent and more family friendly in 2003)
 * the Galápagos tortoise (originally going to be the second Disney film set in China, but cancelled in 2000 for the Box-Office failure of Fox Animation Studios' Titan A.E.. DreamWorks revived the project as Kung Fu Panda in 2004 after the success of DreamWorks' Shark Tale)
 * How to Train Your Dragon (sold to DreamWorks in 2007 after Universal Studios purchased Barbie)
 * E.B. the Eater Rabbit (the project was sold to Illumination Entertainment and is renamed Hop by 2009 after the UNESCO launches The World Digital Library)
 * The Tale of Despereaux (project was sold to Universal in 2006 after Disney purchased Pixar)
 * Ferdinand the Bull (Feature film based on the book, but sold the project to 20th Century Fox Animation in 2011 for stealing an idea of the film adaption from Munro Leaf, although Disney already made a short film version of Ferdinand in 1938)
 * Rio (production started in 1995, but sold to Blue Sky Studios in 2002 after Treasure Planet failed at the Box Office)
 * 1906 (abandoned, but then sold to Warner Bros.)
 * Newt (cancelled in early 2010 because of Metro-Goldwyn-Mayer's chapter 11 bankruptcy)
 * ShadeMaker (cancelled in 2012 due to creative differences)
 * The Moodsters (On June 20, 2017, a woman named Denise Daniels accused Disney and Pixar for stealing an idea from her creation for this movie)