But the cuckoo's mouth does not change color in this way. This peculiarity baffles today's scientists, but it has also fueled human imaginations for thousands of years.
就這杜鵑，嘴巴沒跟著身體長大而變色，雖然讓今天的科學家百思不得其解，千年來卻也讓人們充分發揮想像。