These days, it's easy to fly across oceans for vacation. Centuries ago, however, crossing the open seas required thorough and accurate planning, handmade boats, and courage. Scientists and historians have long been looking for clues to explain who crossed which oceans first. When it comes to the trip between Polynesia   and South America, chickens may have been among the first ocean voyagers, according to new evidence.     After studying an ancient chicken bone, anthropologists   from the University of Auckland in New Zealand now say that people and chickens traveled from Polynesia to what is now Chile   by about 620 years ago. By then, the Inca people were already living in South America, but the Polynesians would have been the first to get there by sea. Previous theories claimed that European explorers and their chickens sailed to South America first -- but those voyagers didn't arrive until about a century later.    In 2002, archaeologists dug up 50 chicken bones from a site in Chile called El Arenal. The team from New Zealand analyzed one to these bones. According to their calculations, the bone is about 650 years old.    The researchers also compared the genetic material, or DNA, from the South American chicken bone with DNA from 11 chicken bones that had been found on the Polynesian islands of Tonga and American Samoa. These islands are 6,000 miles west of Chile. The bones found on the Polynesian islands are been 600 and 2,000 years old.    Results of the comparisons showed that the chicken bones from both the Polynesian and South American sites had part of DNA in common. The researchers found the same part of DNA in feathers of two living chickens in Chile that belong to a modem breed that lays blue eggs. That DNA evidence suggests a close relationship among the chickens.    "However, the weight of scientific evidence is now behind the hypothesis   that it was seafaring ( ) Polynesians who sailed from the islands to South America and returned," says archaeologist Patrick V. Kirch of the University of California, Berkeley. When did the first European explorers reach South America?
About 520 years ago. About 2.000 years ago. About 600 years ago. About 620 years ago.