Liang Chieh-te, who has conducted bird surveys for the Academia Sinica's Institute of Zoology, was once passing by a field in Changhua County when he saw a cuckoo caught in a net trap and went to release it. When the bird opened its beak, he saw that the inside of its mouth was a color "like the fiery red of the setting sun."
曾為中研院動物所進行鳥類調查的梁皆得，一次路經彰化農田邊，為一隻誤入鳥網的杜鵑解開纏縛，發現鳥張大口，嘴內「像太陽西下時的火紅」，多年後他仍清楚記得那醒目的顏色。