"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.
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The first Deinonychus fossils were found in 1931 in southern Montana but it wasn't until 1969 that studies were published and it was officially named. Other Deinonychus fossils have since been found in Oklahoma and other parts of North America.