Which of these Disney productions was released earlier--The Three Caballeros or The Monkey's Uncle?  
The Monkey's Uncle: The Monkey's Uncle is a 1965 Walt Disney production starring Tommy Kirk as genius college student Merlin Jones and Annette Funicello (Who was a member of the mouseketeers from The Mickey Mouse Club) as his girlfriend, Jennifer. The Three Caballeros: The Three Caballeros is a 1944 American live-action animated musical package film produced by Walt Disney and released by RKO Radio Pictures.
The Three Caballeros