The diplodocus isa plant eating dinosaur.The fossils were found in north amrica,colubia,montana utah, and wyoming.It was 35m[115ft]and around to 10to15 tons.My dinosaur is a prey.The pearson who found the fossils is s.w. willson.The dinosaur                  that ate the diplodocus was the allosaurus and the ceratsauras.It lived in the jurastic period.The diplodocus was the size of  tennis court.

Scientest think that the diplodocus  stood onits back legs to eat plants off of trees.