Millions of years before the arrival of the mighty Tyrannosaurus rex, another fearsome dinosaur — the Gnathovorax — roamed what is now southern Brazil, ripping apart its prey with sharp teeth. Measuring nearly 10 feet (three meters) long, it was the biggest dinosaur of its time, and also the most ferocious — placing it at … Continue reading In Brazil’s pampas, a Triassic Park once flourished