After that first encounter, Hsu used sonar location and tracking methods he had learned in the navy to try to find the frogs. He would go out at night and play recordings of their calls to entice the frogs to respond. He also got two of his farm workers to help him triangulate the frogs 'hiding places by listening to their calls from three different locations.
有了第一次經驗，許瑞明還利用海軍所學的「聲納定位法」、「迷蹤追蹤法」，在夜間播放橙腹樹蛙的錄音帶，引誘林間的同類鳴叫現蹤；或者與農場上的另 2 位工作伙伴分別站在 3 個地點，同時指出蛙鳴方向，交集出青蛙可能的藏身範圍。