Polynesia of the plant in the Cook Islands have been radiocarbon-dated to 1000, and current thinking is that it was brought to central Polynesia c. 700 and spread across Polynesia from there, possibly by Polynesians who had traveled to South America and back. Thor Heyerdahl proposed in the mid-20th century that the Polynesians had migrated from the northwest coast of Canada by large whale-hunting dugouts, and from South America on balsa-log boats. Many anthropologists have criticised Heyerdahl's theory, including Wade Davis in his book "The Wayfinders". Davis says that Heyerdahl "ignored the overwhelming body of linguistic, ethnographic, and ethnobotanical evidence, augmented
Marquesan Dog and is visible today at the site of Iʻipona. Only one of the dog carving is discernible now; the other one has weathered away. In 1956, Norwegian adventurer and ethnographer Thor Heyerdahl later claimed the reliefs on Tiki Makiʻi Tauʻa Pepe were llamas or pumas instead to bolster his theory that Polynesia was settled from South America. Later unidentified writers and rumors have insinuated that Heyerdahl deliberately altered and defaced the images in his process of restoring them. The modern consensus is that the carvings represent the extinct dog; they do not represent llamas, pumas or rats. In 1956, Robert