@KasparV; There was a Discovery special about it. Legends said the statues “walked”. They made one from concrete and found out how to walk it into place by rocking it with ropes. Once they got started, it was fairly easy to keep it going at a pretty good clip, considering.
" In a piece of experimental archaeology, a team of local and U.S. researchers showed that the massive statues, known as moai, can be moved from side to side by a small number of people, just as one might move a fridge.
“We constructed a precise three-dimensional 4.35 metric ton replica of an actual statue and demonstrated how positioning the center of mass allowed it to fall forward and rock from side to side causing it to ‘walk,’” Carl Lipo, an archaeologist at California State University, Long Beach, and colleagues wrote in the Journal of Archaeological Science."