Ten million years ago, long before the modern Amazon took shape, a vast inland sea stretched across South America and nurtured a world of giants — and one predator above all others held dominion over them. A new study published in the Journal of Vertebrate Paleontology, led by Oscar Wilson of the University of Helsinki, uses fossil bite marks to confirm that Purussaurus neivensis, a seven-meter, 1,800-kilogram crocodilian, was the true apex predator of Miocene South America, outranking saber-toothed mammals and terror birds alike. The research reminds us that ecosystems are not merely collecti