This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Fylgja (Scandinavian)
The word fylgja means "to accompany" similar to that of the Fetch in Irish folklore. In some instances, the fylgja can take on the form of the animal that shows itself when a baby is born or as the creature that eats the afterbirth. In some literature and sagas, the fylgjur can take the form of mice, dogs, foxes, cats, birds of prey, or carrion eaters because these were animals.Animal forms
Other ideas of fylgjur are that the animals reflect the character of the person they represent, akin to a totem animal. Men who were viewed as a leader would often have fylgja to show their true character. The animal fylgja is said to appear in front of its owner, often in dreams, and offer portents of events to come. As such it is a representation of the future itself, not the character of a person.