1. The teeth of the Apatosaurus were flat.

2. The nostrils of the Apatosaurus were on the top of its head.

3. But even at a mere 18 tonnes, Apatosaurus would still have been an awesome sight.

4. The scientists also plugged in the numbers for Apatosaurus, another huge plant-eating dinosaur.

5. They would kill and ate Stegosaurus, Apatosaurus and Iguanodon. It would also eat dead dinosaurs killed by others.

6. Gary Packard of Colorado State University and his colleagues do not deny that creatures like Apatosaurus, Brachiosaurus and Diplodocus were big—and bigger than any terrestrial mammal.

7. These animals are small herbivores that are most likely the ancestors of the giant apatosaurus (once known as brontosaurus).

8. But over the course of 80 million years, they evolved into tractor-trailer sized, long-necked plant-eaters—like Apatosaurus, formerly known as Brontosaurus.

9. A complete and beautifully preserved saurischian hip girdle was the most stunning, but many other sauropod bones were collected, including sections of backbones from an Apatosaurus and a Camarasaurus.