Shadow creatures: https://en.wikipedia.org/wiki/Shadow_person ; http://www.trueghosttales.com/shadow-creatures.php
Monsters with lots of heads: https://en.wikipedia.org/wiki/Polycephaly
Fairies: https://en.wikipedia.org/wiki/Fairy ; https://en.wikipedia.org/wiki/Microorganism
Fiji Mermaid: https://en.wikipedia.org/wiki/Fiji_mermaid
Vampire bats: https://en.wikipedia.org/wiki/Vampire_bat
Werewolves: https://en.wikipedia.org/wiki/Werewolf ; https://en.wikipedia.org/wiki/Hypertrichosis
Dragons: https://en.wikipedia.org/wiki/Dragon ; http://www.mnn.com/earth-matters/animals/photos/12-animals-mistaken-for-mythical-creatures/theropods
Aliens: https://en.wikipedia.org/wiki/Extraterrestrial_life
Loch Ness Monster and Big Foot: http://www.faqkids.com/myths-legends ; https://en.wikipedia.org/wiki/Plesiosauria