Backstreet Boys

The Backstreet Boys are an American pop band consisting of A. J. McLean, Howie Dorough, Brian Littrell, Nick Carter, and Kevin Richardson. They make guest appearances in the special "Arthur, It's Only Rock 'n' Roll".

Members Who Were Animals
Nick Carter - Bear A.J. McLean - Bear Kevin Richardson - Bear Brian Littrell - Rabbit Howie Dorough - Rabbit

Trivia

 * Muffy's favorite Backstreet Boy was first Nick, then Howie, and currently A.J.
 * The song Muffy was watching on her TV was the Backstreet Boys performing "I Want it That Way."
 * The song behind the background of the stage was "Larger than Life".