 SPOILER: Bugs Bunny needed to be used at the end, because no other  character had any kind of antagonism with Daffy (acquired by Bugs  over the course of the Hunting Trilogy in _Rabbit Fire (1951)_ (qv),  _Rabbit Seasoning (1952)_ (qv) and  _Duck! Rabbit, Duck! (1953)_ (qv)) and Elmer Fudd is not a competent  enough character 