Is fantasy or science fiction your genre? Do you think it might be? Then you may be looking for a creature or a race to populate your world. Here are a few oldies you might want to adapt. A friend of mine, E.R. Barr, melded the Piasa legend with Celtic mythology in his award-winning debut novel, Roan: The Tales of Conor Archer.

Ten Mythological Creatures in Ancient Folklore | Ancient Origins
http://www.ancient-origins.net/myths-legends/ten-mythological-creatures-ancient-folklore-001805