Polynesian navigation snow. In the mid-20th century, Thor Heyerdahl proposed a new theory of Polynesian origins (one which did not win general acceptance), arguing that the Polynesians had migrated from South America on balsa-log boats. The presence in the Cook Islands of sweet potato that is a plant native to the Americas (called "kūmara" in Māori), which have been radiocarbon-dated to 1000 CE, has been cited as evidence that Americans could have traveled to Oceania. The current thinking is that sweet potato was brought to central Polynesia circa 700 CE and spread across Polynesia from there, possibly by Polynesians who had traveled
Kon-Tiki (2012 film) the ropes." Thor Heyerdahl, Jr., who worked with Watzinger, concurred in the criticism of the film's portrayal of Watzinger. Other minor alterations from Heyerdahl's book include the ship's parrot being eaten by a shark in the film (its real-life counterpart was simply washed overboard by a large wave). The film also shows the crew only getting access to valuable US military equipment once they have arrived in Peru and are building the raft, whereas Heyerdahl in fact arranged for the equipment at a visit to the Pentagon before traveling to Peru. The film premiered on 18 August 2012 at the