At the request of the Forestry Bureau, from 2004 to 2005 Sun monitored mountain hawk-eagle populations in the mountains around Southern and Northern Mt. Tawu, and by interviewing hunters, surveyed trends in the number of eagles caught.
他受林務局委託，於 2004-2005 年在南、北大武山地區進行熊鷹族群監測研究，並以訪談獵人的方式，調查獵捕量變動的情況。