So, at José's suggestion, they become diamond hunters in the Mato Grosso, where Donald buys an ox and a llama to explore the interior plateau of Brazil.
This is the final straw for Donald, remembering his relatives' mistreatment of him, and he grabs a vine, jumps on the chief's canoe, and they fight.
The chief goes over the falls and the caballeros ride the anaconda out of the swamp where they meet the Indian tribe, who give Panchito the necklace his horse found.
Their role in catching the Chief, a notorious animal rustler, gains José fame for his nightclub act; with the necklace, Panchito has the money for the ranch he has always wanted to buy.
Joyfully, the Three Caballeros carouse down the famous Portuguese pavement on Copacabana beach, singing their song.