This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Wyvern (Germanic Heraldic)
The wyvern (WY-v?rn, sometimes spelled wivern) is a type of mythical dragon with two legs, two wings, and often a pointed tail which is said to be a venomous stinger. According to the Oxford English Dictionary, the word is a development of Middle English wyver, from Anglo-French wivre, which originate from Latin v?pera, meaning "viper", "adder", or "asp".
A Wyvern is a dragon that most recognizably has two legs as opposed to four. In modern fantasy, wyverns are distinguished as smaller, more animalistic variants of the modern dragon that may or may not have a venomous stinger at the end of their tail.