Rapa Nui

Rapa Nui is the standard parable for a society destroying itself through environmental recklessness. As usually told, the islanders cut down their forest to move statues, lost their canoes and their soil, fell into famine and warfare, and toppled the moai. It is taught, and it has been the frame for a bestselling account of civilisational collapse. The evidence for it has been substantially eroded.

Take the elements separately.

The forest did disappear, that is not in dispute. But the palm was slow-reproducing and the Polynesian rat, arriving with the settlers, ate the seeds; rat-gnawed palm nuts are found in quantity, and rat predation is now considered a major driver of the loss alongside human clearance.

Agriculture did not fail. The islanders practised lithic mulching, breaking rock across the fields to reduce evaporation, moderate temperature and release minerals. It is a sophisticated response to poor volcanic soil, and studies of the area under cultivation indicate it supported the population sustainably rather than teetering.

The population crash is not visible where it should be. Analyses of settlement patterns, of radiocarbon date distributions, and of ancient genomes have not found the great pre-contact collapse the story requires. Genomic work indicates a population that grew steadily and did not pass through a severe pre-European bottleneck.

The statue-toppling was not necessarily famine warfare. Moai were pulled down over a long period, and the process continued after European contact; the timing does not map onto the collapse narrative cleanly, and some of it is better read as change in religious practice than as anarchy.

What is documented beyond argument is what was done to the island from outside. Peruvian slave raids in 1862 and 1863 seized a very large share of the population, including much of the ruling and priestly class, and with them a great deal that only they knew, which is the principal reason the rongorongo script cannot now be read. The few who were repatriated brought smallpox. By 1877 about a hundred and ten people remained alive on the island. The subsequent history includes annexation by Chile in 1888, the leasing of nearly the whole island to a sheep company, and the confinement of the Rapa Nui population to Hanga Roa for decades.

The moai themselves are frequently misdescribed. They are ancestors, named figures of particular lineages, carved mainly from tuff at the Rano Raraku quarry between about 1250 and 1500 and raised on ahu along the coast, and they face inland, over the settlements they protected. They are not idols watching the sea.

Hoa Hakananai'a, a basalt moai of unusual quality taken from Orongo by the crew of HMS Topaze in 1868 and presented to the British Museum, is the subject of a return request made by the island's community and its governor. It has not been granted. The national park has been administered since 2016 by Ma'u Henua, a Rapa Nui community body.

Rapa Nui stopped building giant stone heads and started staging an annual swimming and climbing competition instead, a religious shift as dramatic as anything in the island's more famous collapse story.

Carved, then moved

The moai were carved chiefly at the Rano Raraku quarry, where hundreds of unfinished statues still stand in various stages of completion, and were then transported, by methods still debated among researchers including a "walking" technique using ropes to rock the upright statue forward, to stone platforms called ahu around the island's coastline, most facing inland toward the settlements they were believed to watch over.

From ancestor statues to a bird cult

Construction of moai appears to have ceased, and the island's religious focus shifted toward the Birdman cult, centred on the ceremonial village of Orongo, where representatives of competing clans undertook a dangerous annual competition to be the first to retrieve a sooty tern's egg from a nearby islet, with the winning chief's clan gaining ceremonial authority for the year, a striking replacement of monumental ancestor veneration with a competitive ritual.

A different explanation for decline

As this entry's companion article notes, the once-standard narrative of the island's population collapsing through self-inflicted deforestation and ecological ruin has been challenged by more recent research pointing instead substantially to disease and slave raiding introduced by European contact as the dominant cause of population loss.