Mauro is the quaternary antagonist of the 2011 20th Century Fox film, Rio. He is a light brown common marmoset who wears a paper clip for a ponytail and one of Nigel's henchmen.
He first appeared in the jungle scene to call in his marmosets. In the bird dancing club, he and the marmosets interrupted the club and the birds began to fight him. On a text message on a phone, a wall reads the sound that a marmoset makes and Mauro looks at at the phone. Mauro never appeared until before the credits appeared. Mauro began to humiliate Nigel after he crashed into a propeller.