This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Yale (Medieval Bestiaries)
The yale is described as an antelope- or goat-like creature with the tusks of a boar and large horns. These horns possess the ability to swivel in any direction which makes them good for both offensive and defensive attacks.
it is the size of the river-horse, has the tail of the elephant, and is of a black or tawny colour.
It has also the jaws of the wild boar, and horns that are moveable, and more than a cubit in length, so that, in fighting, it can employ them alternately, and vary their position by presenting them directly or obliquely, according as necessity may dictate. The antelope and water buffalo inhabit this region and loosely match his description, so may have given rise to his misunderstanding.