This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Skeleton (Medieval folklore)
A skeleton is a type of physically manifested undead often found in fantasy, gothic, and horror fiction, as well as mythology, folklore, and various kinds of art. Most are human skeletons, but they can also be from any creature or race found on Earth or in the fantasy world.
Animated human skeletons have been used as an image of death in Western culture since the Middle Ages, perhaps influenced by the valley of the dry bones in the Book of Ezekiel. The Grim Reaper is often depicted as a hooded skeleton holding a scythe. Death as one of the biblical horsemen of the Apocalypse has been depicted as a skeleton riding a horse.