Scientists in Argentina have discovered the earliest-known "giant" dinosaur, revealing the evolution of gigantism began around 20 million years. The dinosaur named Ingentia prima, meaning "the first giant,” was up to 33ft long and weighed about 10 tons, living about 210 million years ago during the Triassic Period. The animal used a novel strategy to become super-sized, involving very fast growth spurts and efficient bird-like lungs, paleontologists claim.