This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Yamata no Orochi (Japanese)
Yamata no Orochi had an eight-forked head and an eight-forked tail; its eyes were red, like the winter-cherry; and on its back firs and cypresses were growing. As it crawled it extended over a space of eight hills and eight valleys. The botanical names used to describe this Orochi are akakagachi or hoozuki, hikage, hinoki (Japanese cypress, and sugi.
The legendary sword Kusanagi-no-Tsurugi, which came from the tail of Yamata no Orochi, along with the Yata no Kagami mirror and Yasakani no Magatama jewel, became the three sacred Imperial Regalia of Japan. Yamata means “eight forks,” referring to the type of branching fork found in a tree or a road. Yet with its neck forking forwards, as it is often depicted, eight forks should mean that the monster has at least nine heads.