The largest group of dinosaurs in Earth's history were sauropods, Dinosaur Santa Bigfoot 2021 Merry Christmas shirt or long-necked plant-eating dinosaurs, and the largest were titanosaurs. Adults can weigh up to 30 tons or even double, and are about 37 meters long. Regarding the extreme difference in shape, it is possible that juveniles and adults of titanosaurs lived separately. Through fossil analysis, scientists discover new features about the appearance of the dinosaurs that dominated the globe in its time, according to The New York Times.