Legend has it that there is a kind of thorn bird that flies in the thorn bushes and sings only when it pricks blood: "This kind of bird sings only once in its life, but its song is more beautiful than the song of any living creature in the world. From the moment it leaves the nest, it is looking for the thorn tree... It plunges its body into the longest and sharpest thorn, and there it is. The wild branches let out a song. It transcended its own pain, and the song eclipsed the skylark and the nightingale. The most beautiful things can only be exchanged for the deepest pain..." Its singing is a song at the cost of life, and it is the most poignant song in the world.