When the lesser coucal serenades its sweetheart in the middle of the night like a half-crazed, guitar-toting lover boy, people in the West give it another name: the "brain-fever bird"! And perhaps because the cuckoo keeps up its mating call for so long that it seems completely addle-headed, in English its name is also used to describe someone as crazy.
至於番鵑有如半夜還拿著吉他對著愛人唱情歌的舉動，西方干脆送它一個別名叫「熱昏頭了」。不知是否也因為杜鵑「叫春」，已經到了神智不清、無法控制的程度，英語裡就借杜鵑來罵人「瘋了！」