Prosauropod Relatives
Anchisaurus is shown here with a few of its larger prosauropod relatives. Prosauropods were among the first big plant-eating dinosaurs. Some experts say that these herbivores grew so big because plant-eaters needed larger digestive systems than the meat-eaters of the same period.
MassospondylusThis dinosaur may have a build similar to one of the giant sauropods, but it measured only sixteen feet long. The tail of Diplodocus, one of the biggest sauropods, measured forty-five feet—about three times as long as one Massospondylus!
PlateosaurusThis was one of the earliest dinosaurs, living about 200 million years ago.