"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.
For a high-urgency land predator alarm call, meerkats will scatter down their nearest burrow entrance. For a high-urgency aerial predator alarm call, they will crouch down and may look skyward.