Generally speaking, geese are larger than ducks--some geese weigh as much as two ducks--so their range extends farther north. There are five or six species of geese with migration routes that sometimes take them through Taiwan, but all of these are rare visitors that usually don't come at all.
一般而言，雁的體型大於鴨，因此分佈範圍較偏北方，在已過北回歸線的台灣小島，野鳥圖鑑上記錄的五、六種雁，盡是不該來也不願來的稀有過境鳥或「迷鳥」。