This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Ypotryll (Heraldic)
The Ypotryll is a Medieval European chimeric creature featured in heraldry. It has the tusked head of a wild boar or hog, the humped body of a camel, the legs and hooves of an ox or goat and the long, scaly tail of a serpent. Its name is thought to be derived from the Greek hippo (horse), or in Middle English ypotame, itself derived from the Latin ypotamus.
Little is known of the creature's meanings or origins, but it appears as the badge of John Tiptoft, 1st Earl of Worcester, also known as the "Butcher of England"; a man known for his extreme cruelty in regards to the execution of Lancastrians during his rule as Lord High Constable in the early 1460s. The creature is known for its awesome ugliness, and is perhaps a reflection of those that wore it as their mark.