Rebbe Isaac Taub of Kalov, zy"a, (1751-1821) overheard this Hungarian song about a bird, being sung by a gentile shepherd boy. He recognized the tune to be from the ancient Holy Temple in Jerusalem. He "bought" the song from the boy, and the boy immediately forgot the song once the Rebbe learned it. Thr Rebbe added the words in Hebrew "יבנה המקדש עיר ציון תמלא", recognizing the story of the bird to actually be a parable of the exile of the Jewish people, and the importance of waiting for G-d to take us home.
"The sun is rising now, the rooster crows now. Near a green forest, is a wide field, where a bird walks around.
What sort of bird is this? What sort of bird is this?
With yellow feet, and a pearl-white beak, he is waiting to go home. With yellow feet, and blue-green wings, he is waiting to go home.
Wait, birdy, wait! Wait, birdy, wait!
Until God decides it is the right time, then you will go home.
But when will it be? But when will it be?
When "The Temple is rebuilt and then the city of Zion will be filled" - that is when it will be. When "The Temple is rebuilt and then the city of Zion will be filled" - that is when it will be."