"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.
A camel's nostrils are amazing. They retain water vapor which can be returned to the body when necessary, but they can also be closed if there is too much sand or wind blowing.
