Large numbers of people believe in demonstrably false phenomena, from UFOs and ESP to Bigfoot and the Loch Ness monster. Even though these fictions have been repeatedly debunked and discredited, they persist in the human imagination and influence our beliefs and our society. Spinning tales of fantastical creatures may seem like a harmless pastime, but when pseudoscientists make revolutionary claims about the world and its history, evidence-based science, public policy, and human progress suffer. Daniel Loxton and Donald R. Prothero complete an entertaining, educational, and definitive text on a variety of cryptids, presenting both the arguments for and against their existence and systematically challenging the pseudoscience perpetuating their myths.