Schedule and migration path similar Mallard ducks are considered a source of spreading bird flu confirmed for the first time in the country of South Korea. According to the National Environmental Research Institute, Mallard ducks that have passed the winter in the river Gokgyo, Asan, South Chungcheong back in November 2011 to that location in December 2012 through the Yalu river and a number of regions in China and Mongolia. It is known by the position detection device attached to the Mallard ducks by the National Environmental Research Institute. Al-result, it obtained information about Mallard duck, like a nest, habits and migration distance. Meanwhile, the results are useful to provide effective measures to prevent the entry of bird flu emerged in China or Mongolia.