Look it up. Again, let s follow the clues. Grass eater, strong mid-section, long tapered tail like a full grown cedar tree, strong bones, dangerous to approach, lives in swamps in the shade of trees, comfortable even in raging waters. There are many large sauropods. I, for one, am unsure if the larger ones couldn t just be older then the smaller ones in many cases and not be a different type.
Dinosaurs are reptiles and reptiles never stop growing.
Therefore, the largest ones are the oldest ones. Their children start out from an egg and just grow until they die. The fact that they got very large means they lived a long time, longer then seems reasonable today. This is one of the reasons many believe the earth was drastically changed forever at the worldwide flood. Dinosaurs were a bigger threat to food supplies and many were reported to attack animals and humans after the flood.