Brontosaurus

The Brontosaurus was a species of dinosaurs that lived in Equestria some millions of years ago. Seemingly gentle beings, Brontosaurus ate plants such as grass and leaves.

History
When the Cutie Mark Crusaders traveled back in time, they came across a feminine Brontosaurus eating grass while next to a Timid Tyrannosaurus

While traveling through the 4th dimension, Zecora found herself in the age of the dinosaurs and encountered two Brontosaurus eating leaves.