The fossils were found in the foothills of the Omani Mountains, which was a lush delta some 70 million years ago, when the hadrosaurs
roamed the area.
At the end of the Cretaceous Period when these hadrosaurs
lived, the Afro-Arabian continent was separated from the northern continents by the wide Tethys Ocean.
There are many interesting questions concerning the changes that were taking place in Patagonia as the hadrosaurs
invaded the south.
Sue's close cousin, Daspletosaurus, hunches over the body of a duck-billed Hadrosaur
Theropod and hadrosaur
prints together hint at a predator-prey relationship.
The team found evidence of the disease in hadrosaurs
, a type of duck-billed dinosaur which lived about 70 million years ago.
Among the last dinosaurs to survive were Montana's and Alberta's hadrosaurs
and ceratopsians, the latter so common that paleontologist Robert Bakker of the University of Colorado calls them "Cretaceous cockroaches.
DALLAS, July 8, 2014 /PRNewswire-USNewswire/ -- A trio of paleontologists have discovered a remarkable new tracksite in Alaska's Denali National Park filled with duck-billed dinosaur footprints - technically referred to as hadrosaurs
- that demonstrates the animals not only lived in multi-generational herds but thrived in the ancient high-latitude, polar ecosystem.
There are lots of hadrosaurs
in this area and the Province of Alberta has the most significant deposits of dinosaurs of any state or province in North America," Brake said.
Of these, six species would have coexisted at any one time, including two types of ankylosaurs (tank-like armoured dinosaurs), two types of hadrosaurs
(duck-billed dinosaurs), and two types of ceratopsids (horn-faced dinosaurs).
But researchers are still debating how exactly hadrosaurs
employed their impressive dental equipment in chewing.
We studied diversity among hadrosaurs
(the duck-billed dinosaurs) in the last five million years of the Cretaceous (145.
A prominent spike on its head--like the horn of the mythical unicorn--sets this duck-billed herbivore apart from hadrosaurs
found in North America.
Readers learn that the noisiest dinosaurs were probably the hadrosaurs
, which had crests on their heads that could have resonated the animals' calls.
One big clue, says Murphy: The right shoulder muscle is larger than expected--which implies hadrosaurs
may have been quadripeds (four-legged walkers), not bipeds as originally suspected.