Mythical Creatures From Folklore, Legends and Fairytales...

 https://parade.com/1056247/marynliles/mythical-creatures

Of course there are various perspectives of mysterious creatures, entities and monsters.

https://en.wikipedia.org/wiki/List_of_legendary_creatures_by_type

https://guides.library.uab.edu/c.php?g=1014328&p=7346790

https://www.theguardian.com/mythical-creatures/ng-interactive/2019/aug/26/most-legendary-mythical-creatures-history

https://reedsy.com/discovery/blog/mythical-creatures

https://www.history.com/news/6-mythical-monsters

https://www.legendsofamerica.com/monsters-of-america

https://en.wikipedia.org/wiki/List_of_legendary_creatures_by_type#Artificial_creatures

https://www.popularmechanics.com/culture/g29995871/mythical-creatures

https://en.wikipedia.org/wiki/List_of_legendary_creatures_by_type#Concepts,_creatures_associated_with

https://en.wikipedia.org/wiki/List_of_theological_demons

https://paranormal-intersection.blogspot.com/search?q=monsters