Moonbeam

The whole story starts at the end of the Moonland, which is on the Moon, as its name says. In the middle of this land stood a palace, built only with gold and diamonds. The moon's surface was covered with grass and other stuff, which were totaly normal and could be found on our planet as well. The queen of this land, called Margaret, was pregnant and ready to born. Before she born her child, Margaret was afraid of the pain that the birth comes with, so he called the doctor to give her a potion. The doctor made a mistake and, because some of his bottles were not labelled, instead of giving her the painless potion he gave her a horsy potion, so she born a horse.

After the birth, Margaret said that the doctor that gave her the wrong potion will be killed.So it happened, the doctor was hanged the very next hour. The horse was abandoned in the nearby forest, where he was vulnerable. In those forests, the legend said that a witch hunts everything still alive and takes it to her home, where no one knows what she'll do to those creatures, only the witch and God could know it...

So the witch did: she found the horse and took the little horse to her home. She brought him in an old barnyard, where she had a female horse which should have taken care of the new-born, so she could do other stuff like... Finally, she called the horse Moonbeam and left him there, to sleep on the wheat in the barnyard.