Dragons are pretty smart and, if willing, can be trained to follow basic commands. Thanks to their scaly armor, they can sleep on anything from jagged rocks to piles of treasure, though they prefer treasure, especially if it belongs to someone else.

Dragons appear in nearly all cultures, though nobody agrees on where the idea began. Some think ancients found dinosaur skeletons and imagined dragons; others think it comes from a shared human fear of snakes and dark caves. What do you think?