Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Regarded as a pseudoscience by mainstream biologists and paleontologists, cryptozoology is a study of unknown or undiscovered animals, with cryptids as the object of their study. The term cryptid refers to various creatures and plants who are suggested to exist by some sources, however without unchallengeable scientific data to prove their existence. Learn more about cryptozoology and some of its most famous subjects in this book.