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Kung Fu Panda: Secrets of the Masters is a 2011 American animated short film produced by DreamWorks Animation. It was released December 13, 2011, as a special feature attached to the 2011 animated film Kung Fu Panda 2 DVD and Blu-ray. The short consists mostly of a traditional animation (17 minutes), created by Duncan Studio. It uncovers the backgrounds of the masters of Gongmen City: Master Thundering Rhino, Master Storming Ox, and Master Croc. Wikipedia