"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.
Due to their great size and strength, St. Bernards have been used for years as mountain rescue dogs. The most successful was Barry, who saved 40 lives during his time in service.