The Silly Symphonies were a series of animated short subjects produced by Walt Disney Productions. A total of 75 shorts were made between 1929 and 1939 while the studio was 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 Three Little Pigs which had three sequels to their first cartoon) and as such were unique in their own way. 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 were separated from the Silly Symphonies group to have their own cartoon series.