For a long, long time, humans have been fascinated with the idea that terrifying creatures may be surviving out somewhere in the periphery, long after they disappeared elsewhere. In the Middle Ages, ...

Tens of millions of years ago, an apex predator resembling a giant crocodile stalked the humid freshwater floodplains of southern Patagonia. Measuring up to 11.5 feet (3.5 meters) long and weighing ...