Before their lineage reached its pinnacle, pun intended, with enormous, aptly named titanosaurs, the sauropodomorph dinosaurs — best known as those long-necked, whip-tailed, four-legged herbivores — started small.

The sheer size of the later behemoths of the Jurassic and Cretaceous worlds have made many of us puny humans wonder how they got so big. Paleontologists thought they had it figured out. But new Triassic fossils from Argentina say hang on, there is more than one way to go big, an