"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
Because of my tremendous respect for Bob Barker and for the show's high standards of professionalism I consider this a tremendous honor that few announcers have ever been treated to. Both Rod's and Johnny's shoes are huge I can't think about filling them.