According to one birdwatcher's observations, the cuckoo really does sing at different times from other birds, and its voice can be heard throughout the day.
根據賞鳥人的觀察，杜鵑確實和一般鳥兒鳴叫時段不同，整日可以聽到它的叫聲，但並非不間斷哀啼如苦旦。