Jack Cutting & Clyde Geronimi (1939)

Originally by Hans Christian Andersen

The Ugly Duckling is the titular protagonist of Disney’s 1939 Silly Symphonies short film of the same name. Actually a cygnet (a baby swan), his egg somehow found its way into the nest of a duck family who mistook him for one of their own, and hatched him, only to immediately reject him for not looking the way a duckling should.