Cryptids of all kinds have long moved in the shadows across what’s now the United States, their legends preserved in Native American traditions that stretch from the Southwest to the Great Lakes and beyond. Acclaimed writer J.W. Ocker introduces us to some of these ancient terrors. Excerpted with permission from The United States of Cryptids: A Tour of American Myths and Monsters, by J. W. Ocker. Published by Quirk Books. All rights reserved. The legend of the wendigo originated with the Algonquin in what is now Canada and the northern…