Outside Mamenchisaurus

Part of the The World's Largest Dinosaurs exhibition.

For 140 million years, sauropods roamed Earth--but today we have just fossils to tell us about what these animals looked like from the outside. How big were they? How big were their young? What did their skin look like? How fast could they move? And while fossils can't answer every question--like what color the animals were--they do reveal an astonishing amount of information that helps paleontologists understand these massive creatures.