Кривенька качечка

An old man lived with his wife, and they did not have kids. To not be bored, they took a duck found in the woods. They began to look after it, and it turned out that it was not a duck at all, but a young girl, hardworking and caring, which helped the old people to stoke and cook food. But with them, she did not shed her feathers, so they decided to find out everything by themselves.