OTAGO, NEW ZEALAND—Researchers using a range of techniques, including radiocarbon dating and ancient DNA analysis, have modeled the population histories of ancient seabirds in New Zealand and found that human hunting had a profound impact on them. According to a University of Otago press release, the study shows that populations of shag seabirds on Stewart Island, New Zealand’s third largest island, had a stable population history, while their counterparts on the two other major islands suffered a massive decline in numbers. "There was a loss of more than ninety-nine percent of their population size within 100 years of human arrival,” says University of Otago geneticist Nic Rawlence. “These once heavily-hunted mainland populations now occupy only a fraction of their prehistoric range, having never really recovered.” The human population on Stewart Island dwindled around 1500 A.D., which might help explain why wildlife populations there did not go into decline. While some scholars believe climatic changes were responsible for the die off, the researchers point out that Stewart Island shared the same climate history as New Zealand’s two major islands, and believe the new findings show prehistoric humans shoulder most of the blame. To read about hunting technology among Australia's Aborigines, go to "What's the Point?"