A new species of dinosaur has been uncovered in the Egyptian desert, a rare discovery in a part of the world not known for dino fossils.

The huge animal, which was roughly the size of a school bus, is an “incredible discovery,” scientists said in a new study that was published Monday.

“This was the Holy Grail — a well-preserved dinosaur from the end of the age of dinosaurs in Africa — that we paleontologists had been searching for for a long, long time,” said Matt Lamanna of the Carnegie Museum of Natural History in Pittsburgh, one of the authors of the study.