This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Sirrush (Akkadian)
The sirrusu or sirrush is a creature from ancient Mesopotamian mythology. A mythological hybrid, it is a scaly animal with hind legs resembling the talons of an eagle, lion-like forelimbs, a long neck and tail, two horns on its head, a snake-like tongue, and a crest.
The creature's feet were remarkable and somewhat unusual. The forefeet being those of a feline, perhaps a leopard or a panther. On the other hand, the hind feet were large and birdlike, with four toes covered with scales. This animal is identical to the dragons guarding Marduk and is considered one of his symbols. The name 'sirrush' originates from the Akkadian word, roughly translated as a 'magnificent serpent.'