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On February 26, 2010, Grover made an appearance to ask the host why we have hair (or, in his case, fur).
On March 30, 2011, Elmo appears again; this time to help celebrate the show's 300th episode.
Cookie Monster made an appearance on December 19, 2011 as a guest judge for the first annual healthy holiday cookie bake-off. On December 21, 2011, Cookie Monster takes a behind-the-scene tour for his appearance on the show.