The funny animal genre evolved in the 1920s and 1930s, at a time when blackface became less socially acceptable. Early black-and-white funny animals, including Oswald the Lucky Rabbit, Mickey Mouse, Foxy the Fox, Felix the Cat and Flip the Frog, maintained certain aspects of the blackface design, including (especially with the advent of sound film) heavy emphasis on song and dance routines. The increased use of Technicolor and other color film processes in the 1930s allowed for greater diversity in the ability to design new "funny animals", leading to a much wider array of funny animal shorts and the near-total demise (except for Mickey Mouse and a few other Disney characters of the era) of the blackface characters. Song and dance fell out of favor and were largely replaced by comedy and satire. The Looney Tunes and Merrie Melodies shorts by Warner Bros. Animation, for instance, introduced dozens of funny animals, many of whom have reached iconic status in American culture. Other notable funny animals from the color film era included Universal's Woody Woodpecker, Wally Walrus, Chilly Willy and Andy Panda; MGM's Tom and Jerry, Screwy Squirrel, Barney Bear and Droopy; and Terrytoons' Heckle and Jeckle, Gandy Goose, Dinky Duck and Mighty Mouse.