John Walrus

John Walrus is a male walrus who appeared in Sherlock Yack: The Movie, and later in the Sherlock Yack series.

Backstory
John Walrus is a walrus who served as a military major back in his day. Now retired, he heard about a zoo and became one of the New Zoo Residents. There, he befriended Hermione the stoat and the zoo's manager and detective, Sherlock Yack.

He decided to tag along with Sherlock and Hermione on the cases. He even helped them in their investigation, including for the crimes committed by the infamous Professor Fox Moriarty.

After the incident with Moriarty, Sherlock decided to make John the new head of security for the whole zoo. That way, he can keep an eye of things, and let Sherlock know if they're any trouble.

Trivia

 * John is the only one in the zoo who actually likes Sherlock bagpipe playing.
 * He usually rides a Segway outside to get around.