|First Appearance||The Mystery of the Stuttering Parrot.|
|Line in clue||"To-to-to be or not to-to-to be, that is the question."|
After John Silver had fled to California after smuggling the painting of the shepherdess, he started living in Ramos Sanchez's house. After getting an idea from the picture that was painted over the shepherdess, Silver bought seven parrots with "pretty yellow heads" and seven cages. He then began teaching them their individual riddles.
After Silver had died, Sanchez waited for the "fat man" who Silver said would come. However, the man didn't come, and all the parrots, including Billy Shakespeare, were sold to different people.
After Claudius came to know about Ramos Sanchez selling the parrots, he found Billy in Malcolm Fentriss' house. Fearing that the owner wouldn't sell the parrot this time, he stole Billy. However, Billy refused to talk to Claudius.
After the entire mystery was solved, Claudius returned Billy to his owner, Fentriss.
- He was named after William Shakespeare, the poet and playwright.
- His speech was Part 2 of the riddle.
- In Polish translation he was referring to Baker Street 333B.