A mystical, mythical, or legendary creature is a creature from mythology or folklore (often known as "fabulous creatures" in historical literature). Examples of legendary creatures can be found in medieval bestiaries. Many mythical creatures have supernatural powers (some good, some evil), powers that even in contemporary times have no physical explanation. In these cases the creatures bear more similarity to spiritual beings, such as angels, in religious thought. Often legendary creatures came to symbolize vices or virtues, or the power of good or evil. In many cases, their actual existence was secondary to the moral of the tale in which they featured.