The Academy Award for Best Animated Short Film is an award which has been given by the Academy of Motion Picture Arts and Sciences as part of the Academy Awards every year since the 5th Academy Awards, covering the year 1931-32, to the present. Walt Disney's Silly Symphonies and MGM's Tom and Jerry were the category's most acclaimed animated series, both winning seven Oscars. Among foreign studios, the National Film Board of Canada has the most wins in this category, with six Oscars. The biggest showing from Britain in this category is Nick Park's Wallace and Gromit with two wins so far.