Battle ostrich.

Among the items stolen from Sheldon in "The Zarnecki Incursion" when Todd Zarnecki hacked his World of Warcraft acount was his battle ostrich named Glenn. He was the only bird he ever loved since Sheldon had ornithophobia, the fear of birds in season 4. The next season he overcame it when a bluejay flew into his apartment and Bernadette helped him overcome his fear.