Wild animals are just as confused as people are now. You've got toxins in the water, oil, sewage, all sorts of things.

In 1933 during the Great Depression Hannah dropped off his portfolio at Walt Disney Studios and soon afterward was hired as an in-between and clean-up artist working on Mickey Mouse Donald Duck and Silly Symphony cartoons. He retired shortly thereafter. He received writing credit on 21 Disney cartoon shorts.

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Hannah then went to the Walter Lantz Studio and directed a number of films featuring Woody Woodpecker and some minor characters. These include most of the shorts featuring Donald Duck in the post-war era along with all starring Chip 'n Dale and Humphrey the Bear; he also directed some shorts starring Goofy Mickey Mouse Pluto and some minor Walt Disney characters. It is for this reason Disney historian Jim Korkis has dubbed him "Donald Duck's Other Daddy.