This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Yali (Hinduism)
Yali, also called Vyala, is a Hindu mythological creature, portrayed with the head and the body of a lion, the trunk and the tusks of an elephant, and sometimes bearing equine features. The creature is represented in many South Indian temples, often sculpted onto the pillars. There also exist variations of the creature, with it possessing the appendages of other beasts.
It has sometimes been described as a leogryph (part-lion and part-griffin), with some bird-like features, with the trunk referred to as a proboscis. Descriptions of, and references to, yalis are ancient, but they became prominent in South Indian sculptures in the 16th century. Yalis were described to be more powerful than the lion, the tiger, or the elephant.