Does the 'Nguoi Rung' roam the forests of Vietnam, or is it a legend?This is my strangest wildlife adventure yet. Through the years, I’ve searched for various rare animals—forest elephants in Borneo, tamaraw in the Philippines, lions in Africa, Komodo dragons in Indonesia. Today, we’re on the trail of an animal that probably doesn’t even exist. This is my first foray into the field of cryptozoology, the study of unknown animals. Bigfoot of North America, the Loch Ness Monster of Scotland, the Yeti of the Himalayas, and the Chupacabra of Mexico are among the world’s best-known cryptids. Most cryptids, like...