What are the enormous stone busts found on Easter Island called?

Rapa Nui is the Polynesian name for Easter Island; its Spanish name is Isla de Pascua. Nearly 900 giant stone statues that have been found in diverse locations around the island. Averaging 13 feet (4 meters) high, with a weight of 13 tons, these enormous stone busts–known as moai–were carved out of tuff (the light, porous rock formed by consolidated volcanic ash) and placed atop ceremonial stone platforms called ahus. It is still unknown precisely why these statues were constructed in such numbers and on such a scale, or how they were moved around the island.

Ahus also contained burial chambers, and the images portrayed by moai are thought to have represented important figures that were deified after death. The biggest statue found dating to the middle period measures about 32 feet tall, and consists of a single block weighing about 82 tons (74,500 kilos).