Shantungosaurus may have been the largest hadrosaur. It is larger than some of the smaller sauropods. Named and described in 1973, Shantungosaurus is known from many disarticulated (not joined) bone from the Shandong Province, China.
Shantungosaurus was a flat-headed Hadrosaur, much like its North American relative Edmontosaurus. The skull was long, with an extended snout and jaws. The jaws had a lot of room for the many teeth. There were as many as 63 places for teeth in each jaw, and there were six teeth in each place. This was probably the most teeth seen in any dinosaur.
Around the nostrils, there was a large hole where there was probably a fleshy "bag." The animal may have inflated the bag to make sounds or to attract a mate. It may have also used it to defend its territory.
The "reptile from Shandong" had very stout back limb bones, which it needed to support its large size. Shantungosaurus probably used both its front and back legs to walk, even when trying to escape from its enemy, Tarbosaurus.
Maiasaura belonged to the family of the duck-billed dinosaurs. It was a large herbivore dinosaur, which grew up to 30 feet in length and could weigh as much as 3 tons. It is believed by researchers that Maiasaura lived in huge herds, some of which may have contained as many as 10,000 members. With so many animals in the herd, Maiasaura may have traveled continuously searching for food, perhaps migrating along well known routes throughout the year, always knowing where the best places where to find adequate supplies of food at different seasons in the year. It is estimated that Maiasaura may have needed to consume 200 pounds of vegetation each day. Maiasaura was primarily a bipedal dinosaur, but could move around in all fours, mainly when feeding on low to the ground vegetation. If attacked by a predator, Maiasaura might have reared up on to its two hind legs and ran for cover. Albertosaurus lived during the time of Maiasaura, and it may have hunted these animals. The first specimens of Maiasaura were discovered by pure luck in 1978, in Montana. Paleontologists Robert Makela and John Horner were in a rock shop in the small town of Bynum, Montana. Among the fossils for sale in the shop, they came across the bones of an unexpected baby dinosaur. The paleontologists were notified where the specimen came from, a range of hills that lay just outside of Bynum. When they visited the site they found not only baby dinosaurs, but eggs and nests. In 1979, the first full-scale field work began at the site revealing more clues into the life of Maiasaura, the “good mother lizard” from 80 million years ago.
Class Order: Ornithischia
Name Meaning: Good mother lizard
Period: Late Cretaceous 80 -65 million years ago
Location: North America
Length: 30 feet (9.15meters)
Weight: 3-4 Tons