Silly Symphonies is a series of animated short subjects, 75 in total, produced by Walt Disney Productions from 1929 to 1939, while the studio was still located at Hyperion Avenue in the Silver Lake district of Los Angeles. Unlike the Mickey Mouse series, to which it is a sister series, Silly Symphonies did not usually feature continuing characters (an exception being the characters in The Three Little Pigs which had three sequels). Donald Duck got his start in a Silly Symphonies cartoon (The Wise Little Hen, 1934), and Pluto's first appearance without Mickey Mouse was also in a Silly Symphonies cartoon (Just Dogs, 1932). Characters such as Donald Duck and Humphrey the Bear were separated from the Silly Symphonies group to have their own cartoon series.