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Ruby is a yellow monster from Sesame Street who is very curious and loves to conduct experiments. For instance, in one episode, Ruby wanted to find out what it was like to be blind, so she spent the entire day wearing a blindfold. She debuted in Season 19 and appeared on the show through Season 23.

Ruby appeared in the Monsterpiece Theater segment "Guys and Dolls," where she sang about her love for trucks. She also appeared on the bus with Farley in the song "Forty Blocks From My Home." 

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