This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Shang-Yang (Chinese)
The Shang Yang resembles a large water bird, its most distinctive feature its single leg. Its appearance was said to cause or predict rain, and it was both respected and feared for its power to create and destroy. Farmers would call on it to help water their crops, and children would hop on one leg and imitate the Shang Yang in hopes of causing it to appear.
It was said that the Shang Yang would drink water from lakes and rivers and blow it out again on the land as rain. However, in other sources it simply functioned as an omen of a coming rainstorm, appearing before leaders to warn them of possible flooding.