Because Harpo couldn't compete with the comedic wits of his brothers, his lines were taken away from him. Though insulted at first, he soon became a gifted mime, particularly in his use of facial expressions and a honking horn.
Harpo Marx (November 23, 1888 – September 28, 1964) was an American comedian and film star. He was the second-oldest of the Marx Brothers. His comic style was influenced by clown and pantomime traditions. He wore a curly reddish blonde wig, and never spoke during performances (he blew a horn or whistled to communicate). Marx frequently used props such as a horn cane, made up of a lead pipe, tape, and a bulbhorn, and he played the harp in most of his films.