This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Druk (Bhutanese)
The Druk is the "Thunder Dragon" of Tibetan and Bhutanese mythology and a Bhutanese national symbol. A druk appears on the flag of Bhutan, holding jewels to represent wealth. In Dzongkha, Bhutan is called Druk Yul "Land of Druk", and Bhutanese leaders are called Druk Gyalpo, "Thunder Dragon Kings".
The druk (also known as a "duk" or "dug") was adopted as an emblem by the Drukpa Lineage, which, when the sect's founder, Tsangpa Gyare, 1st Gyalwang Drukpa, began to build Ralung Monastery, there was a violent storm. Thunder, or the "Cloud-Voice," is seen as the roar of the dragon. Deciding that this was an omen, he named the monastery Drug-Ralung, adding the word "thunder dragon" to the name.