This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Stymphalian Bird (Greek)
The Stymphalian birds are a group of voracious birds in Greek mythology. The birds' appellation is derived from their dwelling in a swamp in Stymphalia. The Stymphalian birds are man-eating birds with beaks of bronze, sharp metallic feathers they could launch at their victims, and poisonous dung.
These birds were pets of Artemis, the goddess of the hunt; or had been brought up by Ares, the god of war. They migrated to a marsh in Arcadia to escape a pack of wolves. There they bred quickly and swarmed over the countryside, destroying crops, fruit trees, and townspeople.