Snow White and the Seven Dwarfs (1937 movie)
Unvoiced characters include Snow White's animal friends, the Queen's raven, and the vultures who follow the Witch. However, although the animals did not have human speaking voices, their natural calls were very lifelike, and were all voiced by champion whistler and animal mimic A. Purves Pullen, who would provide bird and animal calls for Disney movies (including numerous Pluto cartoons) for several decades. Pullen also produced the bird calls for the Enchanted Tiki Room attractions at Disney theme parks. During the 1940s and 1950s, he performed as "Dr. Horatio Q. Birdbath" with the