LifeWe may finally know why dinosaurs like T. rex evolved tiny arms Five different groups of predatory dinosaurs independently evolved disproportionately small arms, and it seems they did so because their heads became so large and powerful 51动漫
LifeNew fossils may settle debate over mysterious sail-backed spinosaurs Spinosaurs have sometimes been portrayed as swimmers or divers, but a new species of these dinosaurs bolsters the idea that they were more like gigantic herons 51动漫