"Release the Kraken!" In H. P. Lovecraft’s short story "The Call of Cthulhu," Cthulhu (described as having a tentacled head) attacks a ship. The sailors try to kill the beast by ramming it repeatedly, but Cthulhu simply turns into green mist and reassembles. Follow #bhlMonstersRreal on Twitter and Facebook to learn more about the real animals that many legendary monsters are based on. See more historic monster illustrations from the Biodiversity Heritage Library.