I flew beside him, hoping he would think of me. He was in a race with a cunning witch who kept slipping past him. He wished himself into a pigeon and then a crow, and then a hawk, but still, he fell behind. His eyes grew dim and his wings flapped heavily, and the witch got past him again.
“Turn yourself into me! Into me!” I cried into his confusion.
All at once he knew! He dressed himself in green and blue, flashed past the woman, and won the race!
Hummingbird in How Ball-Carrier Finished His Task, Brown Fairy Book