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In page Bill Tytla:

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Tytla in The Cookie Carnival was responsible for animating the gingerbread boy and girl as well as the rivalry between the angel-food and devil's food cakes. He animated the broadly comic Clarabelle Cow in Mickey's Fire Brigade. In Cock o' the Walk, Tytla animated his first "heavy," a bully rooster dancing the Carioca. Grim Natwick, creator of Betty Boop, remarked, "Bill hovered over his drawing board like a giant vulture protecting a nest filled with golden eggs, he was an intense worker—eager, nervous, absorbed... Key drawings were whittled out with impassioned pencil thrusts that tore holes in the animation paper."