A baby whale is called a calf. Whales form groups to look after calves and feed together. These groups are often made up of all female or all male whales.
"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.