Regal tells the story of the engagement of philosophers, naturalists and scientists in what we now call cryptozoology, a much longer history than most appreciate. Most believe cryptozoology--the study of mysterious, unrecognized creatures--emerged in the twentieth century. But the fascination with monsters and the unknown stretches back to the ancient world. Long before the term was coined, philosophers and naturalists pondered the existence of cryptids, weaving them into the fabric of scientific curiosity. Challenging the notion that mainstream science has always dismissed cryptids, it reveals a rich history of inquiry and debate. Offering a groundbreaking examination of the long and complex history of cryptozoology, Regal situates it within broader debates about biology, evolution, and the limits of scientific knowledge. A fascinating read for students and scholars of cryptozoology, the history of biology and zoology, and science technology and society studies.